Month	Dollars Per Ton
1921-01-01	32.7600
1921-02-01	28.6500
1921-03-01	25.9100
1921-04-01	24.4600
1921-05-01	23.5600
1921-06-01	22.3500
1921-07-01	20.7900
1921-08-01	19.9300
1921-09-01	20.5400
1921-10-01	20.5600
1921-11-01	20.1600
1921-12-01	19.4200
1922-01-01	18.7800
1922-02-01	18.2900
1922-03-01	18.2200
1922-04-01	19.7300
1922-05-01	22.8300
1922-06-01	23.3000
1922-07-01	23.0600
1922-08-01	26.6100
1922-09-01	31.9700
1922-10-01	30.7500
1922-11-01	27.4000
1922-12-01	25.4000
1923-01-01	26.2400
1923-02-01	26.9600
1923-03-01	29.8600
1923-04-01	30.4000
1923-05-01	29.4300
1923-06-01	27.6300
1923-07-01	25.9500
1923-08-01	25.3400
1923-09-01	24.8900
1923-10-01	23.3200
1923-11-01	21.6600
1923-12-01	22.1600
1924-01-01	22.5200
1924-02-01	23.3000
1924-03-01	23.2700
1924-04-01	22.6700
1924-05-01	21.7300
1924-06-01	20.6000
1924-07-01	19.4600
1924-08-01	19.3200
1924-09-01	19.5500
1924-10-01	19.4500
1924-11-01	19.5800
1924-12-01	21.4100
1925-01-01	22.2000
1925-02-01	22.1000
1925-03-01	21.5900
1925-04-01	20.8500
1925-05-01	20.0900
1925-06-01	19.4100
1925-07-01	18.9400
1925-08-01	18.9400
1925-09-01	19.3000
1925-10-01	19.8000
1925-11-01	21.1800
1925-12-01	21.5900
1926-01-01	21.5900
1926-02-01	21.5900
1926-03-01	21.5900
1926-04-01	20.6200
1926-05-01	20.4900
1926-06-01	19.8000
1926-07-01	19.5200
1926-08-01	19.3800
1926-09-01	19.3500
1926-10-01	19.6000
1926-11-01	19.9500
1926-12-01	19.8700
1927-01-01	19.1400
1927-02-01	18.9400
1927-03-01	19.0800
1927-04-01	19.2500
1927-05-01	19.0100
1927-06-01	18.7700
1927-07-01	18.4200
1927-08-01	18.1700
1927-09-01	18.0300
1927-10-01	18.0200
1927-11-01	17.5900
1927-12-01	17.5000
1928-01-01	17.4900
1928-02-01	17.4900
1928-03-01	17.4900
1928-04-01	17.4900
1928-05-01	17.1400
1928-06-01	16.8300
1928-07-01	16.8200
1928-08-01	16.8400
1928-09-01	17.2100
1928-10-01	17.5600
1928-11-01	17.9300
1928-12-01	18.0100
1929-01-01	17.9300
1929-02-01	17.9300
1929-03-01	17.8600
1929-04-01	17.8600
1929-05-01	18.0700
1929-06-01	18.1000
1929-07-01	17.9700
1929-08-01	17.9400
1929-09-01	17.9400
1929-10-01	17.9400
1929-11-01	17.9400
1929-12-01	17.9400
1930-01-01	17.9400
1930-02-01	17.9700
1930-03-01	17.9400
1930-04-01	17.7700
1930-05-01	17.7700
1930-06-01	17.7700
1930-07-01	17.5000
1930-08-01	17.4400
1930-09-01	17.2500
1930-10-01	16.8200
1930-11-01	16.7600
1930-12-01	16.7600
1931-01-01	16.6800
1931-02-01	16.2700
1931-03-01	15.8700
1931-04-01	15.9400
1931-05-01	15.8700
1931-06-01	15.6600
1931-07-01	15.6600
1931-08-01	15.6600
1931-09-01	15.6600
1931-10-01	15.4600
1931-11-01	15.1600
1931-12-01	15.0400
1932-01-01	14.8400
1932-02-01	14.4300
1932-03-01	14.3500
1932-04-01	14.3500
1932-05-01	14.1500
1932-06-01	14.0100
1932-07-01	13.8700
1932-08-01	13.8700
1932-09-01	13.8700
1932-10-01	13.8700
1932-11-01	13.8700
1932-12-01	13.8700
1933-01-01	13.8700
1933-02-01	13.8700
1933-03-01	13.8700
1933-04-01	13.9600
1933-05-01	14.4700
1933-06-01	15.0100
1933-07-01	15.5100
1933-08-01	16.1800
1933-09-01	16.8500
1933-10-01	16.8400
1933-11-01	16.8400
1933-12-01	16.8400
1934-01-01	16.8400
1934-02-01	16.8400
1934-03-01	16.8400
1934-04-01	17.0100
1934-05-01	17.7700
1934-06-01	17.8400
1934-07-01	17.8400
1934-08-01	17.8400
1934-09-01	17.8400
1934-10-01	17.8400
1934-11-01	17.8400
1934-12-01	17.8400
1935-01-01	17.8400
1935-02-01	17.8400
1935-03-01	17.8400
1935-04-01	17.8400
1935-05-01	17.8500
1935-06-01	17.8500
1935-07-01	17.8500
1935-08-01	17.8500
1935-09-01	17.8500
1935-10-01	17.8500
1935-11-01	18.6000
1935-12-01	18.8500
1936-01-01	18.8500
1936-02-01	18.8500
1936-03-01	18.8500
1936-04-01	18.8500
1936-05-01	18.8500
1936-06-01	18.8500
1936-07-01	18.7700
1936-08-01	18.7700
1936-09-01	18.7700
1936-10-01	18.7700
1936-11-01	19.0200
1936-12-01	19.7700
1937-01-01	20.2700
1937-02-01	20.5200
1937-03-01	22.8600
1937-04-01	23.2700
1937-05-01	23.2700
1937-06-01	23.2700
1937-07-01	23.2700
1937-08-01	23.2700
1937-09-01	23.2700
1937-10-01	23.2700
1937-11-01	23.2700
1937-12-01	23.2700
1938-01-01	23.2700
1938-02-01	23.2700
1938-03-01	23.2700
1938-04-01	23.2700
1938-05-01	23.2700
1938-06-01	22.3500
1938-07-01	19.2700
1938-08-01	19.2700
1938-09-01	19.5000
1938-10-01	20.2700
1938-11-01	20.2700
1938-12-01	20.2700
1939-01-01	20.2700
1939-02-01	20.2700
1939-03-01	20.2700
1939-04-01	20.2700
1939-05-01	20.2700
1939-06-01	20.2700
1939-07-01	20.2700
1939-08-01	20.2700
1939-09-01	21.2900
1939-10-01	22.2700
1939-11-01	22.2700
1939-12-01	22.2700
1940-01-01	22.2700
1940-02-01	22.2700
1940-03-01	22.2700
1940-04-01	22.2700
1940-05-01	22.2700
1940-06-01	22.2700
1940-07-01	22.2700
1940-08-01	22.2700
1940-09-01	22.2700
1940-10-01	22.2700
1940-11-01	22.2700
1940-12-01	22.2700
1941-01-01	22.9500
1941-02-01	22.9500
1941-03-01	23.1100
1941-04-01	23.2700
1941-05-01	23.2700
1941-06-01	23.2700
1941-07-01	23.2700
1941-08-01	23.2700
1941-09-01	23.2700
1941-10-01	23.2700
1941-11-01	23.2700
1941-12-01	23.2700
1942-01-01	23.2700
1942-02-01	23.2700
1942-03-01	23.2700
1942-04-01	23.2700
1942-05-01	23.2700
1942-06-01	23.2700