Month	Thousands Of Train-Hours
1920-01-01	5349.00
1920-02-01	4787.00
1920-03-01	5337.00
1920-04-01	4259.00
1920-05-01	4856.00
1920-06-01	4870.00
1920-07-01	5152.00
1920-08-01	5451.00
1920-09-01	5398.00
1920-10-01	5630.00
1920-11-01	5317.00
1920-12-01	5101.00
1921-01-01	4411.00
1921-02-01	3587.00
1921-03-01	3741.00
1921-04-01	3437.00
1921-05-01	3526.00
1921-06-01	3550.00
1921-07-01	3623.00
1921-08-01	3907.00
1921-09-01	3928.00
1921-10-01	4581.00
1921-11-01	4023.00
1921-12-01	3604.00
1922-01-01	3681.00
1922-02-01	3677.00
1922-03-01	4184.00
1922-04-01	3400.00
1922-05-01	3690.00
1922-06-01	3770.00
1922-07-01	3692.00
1922-08-01	4100.00
1922-09-01	4538.00
1922-10-01	5188.00
1922-11-01	5168.00
1922-12-01	5156.00
1923-01-01	5221.00
1923-02-01	4704.00
1923-03-01	5333.00
1923-04-01	4930.00
1923-05-01	4950.00
1923-06-01	4689.00
1923-07-01	4686.00
1923-08-01	4902.00
1923-09-01	4833.00
1923-10-01	5342.00
1923-11-01	4895.00
1923-12-01	4415.00
1924-01-01	4701.00
1924-02-01	4617.00
1924-03-01	4580.00
1924-04-01	4022.00
1924-05-01	4078.00
1924-06-01	3802.00
1924-07-01	3960.00
1924-08-01	4175.00
1924-09-01	4467.00
1924-10-01	4905.00
1924-11-01	4457.00
1924-12-01	4484.00
1925-01-01	4592.00
1925-02-01	4045.00
1925-03-01	4154.00
1925-04-01	3916.00
1925-05-01	4026.00
1925-06-01	3967.00
1925-07-01	4153.00
1925-08-01	4424.00
1925-09-01	4525.00
1925-10-01	4990.00
1925-11-01	4657.00
1925-12-01	4548.00
1926-01-01	4468.00
1926-02-01	4142.00
1926-03-01	4499.00
1926-04-01	4130.00
1926-05-01	4183.00
1926-06-01	4094.00
1926-07-01	4299.00
1926-08-01	4433.00
1926-09-01	4583.00
1926-10-01	4951.00
1926-11-01	4703.00
1926-12-01	4620.00
1927-01-01	4406.00
1927-02-01	4002.00
1927-03-01	4369.00
1927-04-01	3992.00
1927-05-01	4078.00
1927-06-01	3912.00
1927-07-01	3883.00
1927-08-01	4219.00
1927-09-01	4311.00
1927-10-01	4575.00
1927-11-01	3954.00
1927-12-01	3835.00
1928-01-01	3839.00
1928-02-01	3700.00
1928-03-01	3993.00
1928-04-01	3662.00
1928-05-01	3830.00
1928-06-01	3637.00
1928-07-01	3756.00
1928-08-01	4049.00
1928-09-01	4090.00
1928-10-01	4545.00
1928-11-01	4037.00
1928-12-01	3726.00
1929-01-01	3951.00
1929-02-01	3827.00
1929-03-01	3952.00
1929-04-01	3724.00
1929-05-01	3862.00
1929-06-01	3681.00
1929-07-01	3841.00
1929-08-01	4025.00
1929-09-01	3958.00
1929-10-01	4373.00
1929-11-01	3773.00
1929-12-01	3564.00
1930-01-01	3661.00
1930-02-01	3243.00
1930-03-01	3368.00
1930-04-01	3269.00
1930-05-01	3311.00
1930-06-01	3075.00
1930-07-01	3201.00
1930-08-01	3256.00
1930-09-01	3239.00
1930-10-01	3325.00
1930-11-01	3001.00
1930-12-01	2806.00
1931-01-01	2785.00
1931-02-01	2488.00
1931-03-01	2772.00
1931-04-01	2694.00
1931-05-01	2723.00
1931-06-01	2627.00
1931-07-01	2738.00
1931-08-01	2641.00
1931-09-01	2557.00
1931-10-01	2758.00
1931-11-01	2377.00
1931-12-01	2266.00
1932-01-01	2210.00
1932-02-01	2097.00
1932-03-01	2292.00
1932-04-01	2089.00
1932-05-01	1998.00
1932-06-01	1932.00
1932-07-01	1916.00
1932-08-01	1988.00
1932-09-01	2121.00
1932-10-01	2403.00
1932-11-01	2093.00
1932-12-01	2080.00
1933-01-01	1940.00
1933-02-01	1862.00
1933-03-01	1912.00
1933-04-01	1892.00
1933-05-01	2038.00
1933-06-01	2099.00
1933-07-01	2234.00
1933-08-01	2264.00
1933-09-01	2247.00
1933-10-01	2355.00
1933-11-01	2173.00
1933-12-01	2051.00
1934-01-01	2189.00
1934-02-01	2105.00
1934-03-01	2428.00
1934-04-01	2113.00
1934-05-01	2206.00
1934-06-01	2178.00
1934-07-01	2167.00
1934-08-01	2268.00
1934-09-01	2249.00
1934-10-01	2373.00
1934-11-01	2131.00
1934-12-01	2110.00
1935-01-01	2282.00
1935-02-01	2111.00
1935-03-01	2292.00
1935-04-01	2091.00
1935-05-01	2135.00
1935-06-01	2116.00
1935-07-01	2079.00
1935-08-01	2209.00
1935-09-01	2256.00
1935-10-01	2562.00
1935-11-01	2314.00
1935-12-01	2298.00
1936-01-01	2486.00
1936-02-01	2608.00
1936-03-01	2488.00
1936-04-01	2398.00
1936-05-01	2403.00
1936-06-01	2360.00
1936-07-01	2522.00
1936-08-01	2529.00
1936-09-01	2577.00
1936-10-01	2889.00
1936-11-01	2676.00
1936-12-01	2785.00
1937-01-01	2751.00
1937-02-01	2609.00
1937-03-01	2839.00
1937-04-01	2573.00
1937-05-01	2584.00
1937-06-01	2503.00
1937-07-01	2597.00
1937-08-01	2571.00
1937-09-01	2612.00
1937-10-01	2798.00
1937-11-01	2402.00
1937-12-01	2336.00
1938-01-01	2189.00
1938-02-01	1948.00
1938-03-01	2140.00
1938-04-01	1972.00
1938-05-01	1959.00
1938-06-01	1965.00
1938-07-01	2054.00
1938-08-01	2159.00
1938-09-01	2205.00
1938-10-01	2448.00
1938-11-01	2236.00
1938-12-01	2236.00
1939-01-01	2181.00
1939-02-01	2026.00
1939-03-01	2233.00
1939-04-01	2009.00
1939-05-01	2087.00
1939-06-01	2134.00
1939-07-01	2161.00
1939-08-01	2271.00
1939-09-01	2456.00
1939-10-01	2743.00
1939-11-01	2482.00
1939-12-01	2334.00
1940-01-01	2543.00
1940-02-01	2271.00
1940-03-01	2308.00
1940-04-01	2214.00
1940-05-01	2307.00
1940-06-01	2240.00
1940-07-01	2332.00
1940-08-01	2460.00
1940-09-01	2453.00
1940-10-01	2696.00
1940-11-01	2545.00
1940-12-01	2563.00
1941-01-01	2602.00
1941-02-01	2437.00
1941-03-01	2776.00
1941-04-01	2411.00
1941-05-01	2809.00
1941-06-01	2821.00
1941-07-01	2986.00
1941-08-01	3072.00
1941-09-01	3048.00
1941-10-01	3343.00
1941-11-01	3050.00
1941-12-01	3087.00
1942-01-01	3236.00
1942-02-01	2992.00
1942-03-01	3364.00
1942-04-01	3341.00
1942-05-01	3490.00
1942-06-01	3401.00
1942-07-01	3548.00
1942-08-01	3675.00
1942-09-01	3697.00
1942-10-01	3984.00
1942-11-01	3710.00
1942-12-01	3828.00
1943-01-01	3820.00
1943-02-01	3614.00
1943-03-01	4016.00
1943-04-01	3768.00
1943-05-01	3785.00
1943-06-01	3602.00
1943-07-01	3805.00
1943-08-01	3835.00