Month	Hours
1921-07-01	9.80000
1921-08-01	9.00000
1921-09-01	9.30000
1921-10-01	10.0000
1921-11-01	9.00000
1921-12-01	8.40000
1922-01-01	9.70000
1922-02-01	9.30000
1922-03-01	9.10000
1922-04-01	8.20000
1922-05-01	8.80000
1922-06-01	8.70000
1922-07-01	17.1000
1922-08-01	23.8000
1922-09-01	26.4000
1922-10-01	23.8000
1922-11-01	20.3000
1922-12-01	20.1000
1923-01-01	18.9000
1923-02-01	17.6000
1923-03-01	16.6000
1923-04-01	15.1000
1923-05-01	16.0000
1923-06-01	15.2000
1923-07-01	15.9000
1923-08-01	15.0000
1923-09-01	15.4000
1923-10-01	15.0000
1923-11-01	12.8000
1923-12-01	11.3000
1924-01-01	12.4000
1924-02-01	12.8000
1924-03-01	11.2000
1924-04-01	9.50000
1924-05-01	9.90000
1924-06-01	9.60000
1924-07-01	9.90000
1924-08-01	10.2000
1924-09-01	10.9000
1924-10-01	10.9000
1924-11-01	10.7000
1924-12-01	11.2000
1925-01-01	12.5000
1925-02-01	10.4000
1925-03-01	9.40000
1925-04-01	8.50000
1925-05-01	9.80000
1925-06-01	9.30000
1925-07-01	10.3000
1925-08-01	10.6000
1925-09-01	11.1000
1925-10-01	11.8000
1925-11-01	11.9000
1925-12-01	11.1000
1926-01-01	11.5000
1926-02-01	11.9000
1926-03-01	10.4000
1926-04-01	9.40000
1926-05-01	10.6000
1926-06-01	10.0000
1926-07-01	11.0000
1926-08-01	11.4000
1926-09-01	12.6000
1926-10-01	12.7000
1926-11-01	12.0000
1926-12-01	11.9000
1927-01-01	11.7000
1927-02-01	10.3000
1927-03-01	9.30000
1927-04-01	9.50000
1927-05-01	10.8000
1927-06-01	9.60000
1927-07-01	10.4000
1927-08-01	10.2000
1927-09-01	10.8000
1927-10-01	10.6000
1927-11-01	9.50000
1927-12-01	9.60000
1928-01-01	9.90000
1928-02-01	8.50000
1928-03-01	8.30000
1928-04-01	8.10000
1928-05-01	8.90000
1928-06-01	8.50000
1928-07-01	9.80000
1928-08-01	9.80000
1928-09-01	10.6000
1928-10-01	10.4000
1928-11-01	9.30000
1928-12-01	9.00000
1929-01-01	10.1000
1929-02-01	9.80000
1929-03-01	9.30000
1929-04-01	8.40000
1929-05-01	9.60000
1929-06-01	9.50000
1929-07-01	10.3000
1929-08-01	10.1000
1929-09-01	10.7000
1929-10-01	10.4000
1929-11-01	8.80000
1929-12-01	10.0000
1930-01-01	9.50000
1930-02-01	7.60000
1930-03-01	7.50000
1930-04-01	6.90000
1930-05-01	7.70000
1930-06-01	7.10000
1930-07-01	7.40000
1930-08-01	7.40000
1930-09-01	7.30000
1930-10-01	7.20000
1930-11-01	6.90000
1930-12-01	6.30000
1931-01-01	6.20000
1931-02-01	5.70000
1931-03-01	6.40000
1931-04-01	5.40000
1931-05-01	6.10000
1931-06-01	5.50000
1931-07-01	6.10000
1931-08-01	5.80000
1931-09-01	5.80000
1931-10-01	5.40000
1931-11-01	5.50000
1931-12-01	5.20000
1932-01-01	5.60000
1932-02-01	5.30000
1932-03-01	5.40000
1932-04-01	4.20000
1932-05-01	4.70000
1932-06-01	4.20000
1932-07-01	5.00000
1932-08-01	4.60000
1932-09-01	5.30000
1932-10-01	5.50000
1932-11-01	4.90000
1932-12-01	5.70000
1933-01-01	4.90000
1933-02-01	5.40000
1933-03-01	4.20000
1933-04-01	4.30000
1933-05-01	5.00000
1933-06-01	4.70000
1933-07-01	5.70000
1933-08-01	5.10000
1933-09-01	5.40000
1933-10-01	4.80000
1933-11-01	4.60000
1933-12-01	5.80000
1934-01-01	5.20000
1934-02-01	7.20000
1934-03-01	5.70000
1934-04-01	4.40000
1934-05-01	4.70000
1934-06-01	4.70000
1934-07-01	5.20000
1934-08-01	4.90000
1934-09-01	5.60000
1934-10-01	5.00000
1934-11-01	4.70000
1934-12-01	5.70000
1935-01-01	7.40000
1935-02-01	5.70000
1935-03-01	5.10000
1935-04-01	4.40000
1935-05-01	5.10000
1935-06-01	5.80000
1935-07-01	5.90000
1935-08-01	5.60000
1935-09-01	6.40000
1935-10-01	6.00000
1935-11-01	5.50000
1935-12-01	6.90000
1936-01-01	8.60000
1936-02-01	11.5000
1936-03-01	8.20000
1936-04-01	5.90000
1936-05-01	6.10000
1936-06-01	5.50000
1936-07-01	6.70000
1936-08-01	6.50000
1936-09-01	6.90000
1936-10-01	7.00000
1936-11-01	6.90000
1936-12-01	7.10000
1937-01-01	9.00000
1937-02-01	8.50000
1937-03-01	6.90000
1937-04-01	5.90000
1937-05-01	6.70000
1937-06-01	6.20000
1937-07-01	6.90000
1937-08-01	6.40000
1937-09-01	6.60000
1937-10-01	6.40000
1937-11-01	5.50000
1937-12-01	6.00000
1938-01-01	6.20000
1938-02-01	5.50000
1938-03-01	5.60000
1938-04-01	4.90000
1938-05-01	5.10000
1938-06-01	4.90000
1938-07-01	5.70000
1938-08-01	5.20000
1938-09-01	6.60000
1938-10-01	6.50000
1938-11-01	5.90000
1938-12-01	5.70000
1939-01-01	6.20000
1939-02-01	5.80000
1939-03-01	5.20000
1939-04-01	4.80000
1939-05-01	5.10000
1939-06-01	5.00000
1939-07-01	5.10000
1939-08-01	5.40000
1939-09-01	6.70000
1939-10-01	6.70000
1939-11-01	5.90000
1939-12-01	6.10000
1940-01-01	8.10000
1940-02-01	6.80000
1940-03-01	5.60000
1940-04-01	5.00000
1940-05-01	5.40000
1940-06-01	5.40000
1940-07-01	6.00000
1940-08-01	6.40000
1940-09-01	6.80000
1940-10-01	6.40000
1940-11-01	6.80000
1940-12-01	7.50000
1941-01-01	7.70000
1941-02-01	7.00000
1941-03-01	8.00000
1941-04-01	6.30000
1941-05-01	7.50000
1941-06-01	8.30000
1941-07-01	8.70000
1941-08-01	8.90000
1941-09-01	9.10000
1941-10-01	9.30000
1941-11-01	8.60000
1941-12-01	9.10000
1942-01-01	10.0000
1942-02-01	9.30000
1942-03-01	9.80000
1942-04-01	9.10000
1942-05-01	10.6000
1942-06-01	10.0000
1942-07-01	11.9000
1942-08-01	13.2000
1942-09-01	15.0000
1942-10-01	16.1000
1942-11-01	16.4000
1942-12-01	17.9000
1943-01-01	19.1000
1943-02-01	18.2000
1943-03-01	19.3000
1943-04-01	18.0000
1943-05-01	21.6000
1943-06-01	20.5000
1943-07-01	22.7000
1943-08-01	24.1000