Month	Dollars Per Ton
1921-01-01	8.84000
1921-02-01	8.84000
1921-03-01	8.84000
1921-04-01	8.84000
1921-05-01	8.84000
1921-06-01	8.84000
1921-07-01	8.84000
1921-08-01	8.84000
1921-09-01	8.84000
1921-10-01	8.84000
1921-11-01	8.84000
1921-12-01	8.84000
1922-01-01	8.65000
1922-02-01	8.59000
1922-03-01	8.59000
1922-04-01	8.84000
1922-05-01	10.2400
1922-06-01	11.1000
1922-07-01	12.1800
1922-08-01	14.6300
1922-09-01	15.4300
1922-10-01	15.4300
1922-11-01	13.2900
1922-12-01	12.8800
1923-01-01	12.8800
1923-02-01	12.8800
1923-03-01	12.8800
1923-04-01	12.8800
1923-05-01	12.3800
1923-06-01	11.8800
1923-07-01	11.3800
1923-08-01	11.3800
1923-09-01	11.4200
1923-10-01	11.3100
1923-11-01	10.9100
1923-12-01	10.9100
1924-01-01	10.9100
1924-02-01	10.9100
1924-03-01	10.9100
1924-04-01	10.5100
1924-05-01	10.4100
1924-06-01	10.4100
1924-07-01	10.4100
1924-08-01	10.4100
1924-09-01	10.4100
1924-10-01	10.4100
1924-11-01	10.4100
1924-12-01	10.4100
1925-01-01	10.4100
1925-02-01	10.4100
1925-03-01	10.4100
1925-04-01	10.4100
1925-05-01	10.4100
1925-06-01	10.4100
1925-07-01	10.4100
1925-08-01	10.4100
1925-09-01	10.4100
1925-10-01	10.7800
1925-11-01	11.0300
1925-12-01	11.2600
1926-01-01	11.2600
1926-02-01	11.2600
1926-03-01	11.2600
1926-04-01	10.1700
1926-05-01	10.1700
1926-06-01	10.1700
1926-07-01	10.1800
1926-08-01	10.1800
1926-09-01	10.1800
1926-10-01	10.1800
1926-11-01	11.1800
1926-12-01	11.1800
1927-01-01	10.4300
1927-02-01	10.1800
1927-03-01	10.1800
1927-04-01	10.1800
1927-05-01	10.1800
1927-06-01	10.1800
1927-07-01	10.1800
1927-08-01	10.1800
1927-09-01	10.1800
1927-10-01	10.1800
1927-11-01	10.1600
1927-12-01	10.1800
1928-01-01	9.40000
1928-02-01	9.20000
1928-03-01	9.20000
1928-04-01	9.20000
1928-05-01	9.20000
1928-06-01	9.20000
1928-07-01	9.20000
1928-08-01	9.20000
1928-09-01	9.20000
1928-10-01	9.20000
1928-11-01	9.20000
1928-12-01	9.20000
1929-01-01	9.20000
1929-02-01	9.20000
1929-03-01	9.20000
1929-04-01	9.20000
1929-05-01	9.20000
1929-06-01	9.20000
1929-07-01	9.20000
1929-08-01	9.20000
1929-09-01	9.20000
1929-10-01	9.20000
1929-11-01	9.20000
1929-12-01	9.20000
1930-01-01	9.20000
1930-02-01	9.20000
1930-03-01	9.20000
1930-04-01	9.20000
1930-05-01	9.20000
1930-06-01	9.20000
1930-07-01	9.20000
1930-08-01	9.20000
1930-09-01	9.20000
1930-10-01	9.20000
1930-11-01	9.20000
1930-12-01	9.20000
1931-01-01	9.20000
1931-02-01	9.20000
1931-03-01	9.20000
1931-04-01	9.20000
1931-05-01	9.20000
1931-06-01	8.90000
1931-07-01	8.90000
1931-08-01	8.90000
1931-09-01	8.90000
1931-10-01	8.90000
1931-11-01	8.90000
1931-12-01	8.90000
1932-01-01	8.95000
1932-02-01	8.96000
1932-03-01	8.96000
1932-04-01	8.88000
1932-05-01	8.51000
1932-06-01	8.51000
1932-07-01	8.51000
1932-08-01	8.51000
1932-09-01	8.51000
1932-10-01	8.51000
1932-11-01	8.51000
1932-12-01	8.51000
1933-01-01	8.51000
1933-02-01	8.51000
1933-03-01	8.51000
1933-04-01	8.51000
1933-05-01	8.51000
1933-06-01	8.51000
1933-07-01	8.51000
1933-08-01	8.51000
1933-09-01	8.81000
1933-10-01	9.01000
1933-11-01	9.01000
1933-12-01	9.01000
1934-01-01	9.01000
1934-02-01	9.01000
1934-03-01	9.01000
1934-04-01	9.01000
1934-05-01	9.01000
1934-06-01	9.01000
1934-07-01	9.01000
1934-08-01	9.01000
1934-09-01	9.01000
1934-10-01	9.01000
1934-11-01	9.01000
1934-12-01	9.01000
1935-01-01	9.11000
1935-02-01	9.42000
1935-03-01	9.42000
1935-04-01	9.42000
1935-05-01	9.42000
1935-06-01	9.42000
1935-07-01	9.42000
1935-08-01	9.42000
1935-09-01	9.42000
1935-10-01	9.42000
1935-11-01	9.42000
1935-12-01	9.42000
1936-01-01	9.80000
1936-02-01	9.92000
1936-03-01	9.92000
1936-04-01	9.92000
1936-05-01	9.92000
1936-06-01	9.92000
1936-07-01	9.92000
1936-08-01	9.92000
1936-09-01	9.92000
1936-10-01	10.4200
1936-11-01	10.4200
1936-12-01	10.4200
1937-01-01	10.3800
1937-02-01	10.3800
1937-03-01	10.3800
1937-04-01	10.9000
1937-05-01	11.0800
1937-06-01	11.0800
1937-07-01	11.0800
1937-08-01	11.0800
1937-09-01	11.0800
1937-10-01	11.0800
1937-11-01	11.0800
1937-12-01	11.1200
1938-01-01	11.1200
1938-02-01	11.1200
1938-03-01	11.1200
1938-04-01	11.1200
1938-05-01	11.1200
1938-06-01	11.1200
1938-07-01	11.1200
1938-08-01	11.1200
1938-09-01	11.1200
1938-10-01	11.1200
1938-11-01	11.1200
1938-12-01	11.1200
1939-01-01	11.1200
1939-02-01	11.1200
1939-03-01	11.1200
1939-04-01	11.1200
1939-05-01	11.1200
1939-06-01	11.1200
1939-07-01	11.1200
1939-08-01	11.1200
1939-09-01	11.1200
1939-10-01	11.4900
1939-11-01	11.6200
1939-12-01	11.6200