| Characteristic | Thousands of metric tons |
|---|---|
| 1988 | 22,507 |
| 1987 | 25,466 |
| 1986 | 22,826 |
| 1985 | 20,438 |
| 1984 | 20,080 |
| 1983 | 19,044 |
| 1982 | 18,955 |
| 1981 | 24,982 |
| 1980 | 21,321 |
| 1979 | 19,954 |
| 1978 | 23,394 |
| 1977 | 22,686 |
| 1976 | 26,658 |
| 1975 | 26,947 |
| 1974 | 20,070 |
| 1973 | 22,225 |
| 1972 | 25,773 |
| 1971 | 24,581 |
| 1970 | 23,930 |
| 1969 | 25,162 |
| 1968 | 23,009 |
| 1967 | 17,415 |
| 1966 | 18,454 |
| 1965 | 18,976 |
| 1964 | 21,218 |
| 1963 | 21,163 |
| 1962 | 16,557 |
| 1961 | 16,061 |
| 1960 | 14,897 |
| 1959 | 15,436 |
| 1958 | 13,744 |
| 1957 | 14,066 |
| 1956 | 11,789 |
| 1955 | 11,096 |
| 1954 | 12,775 |
| 1953 | 10,962 |
| 1952 | 9,225 |
| 1951 | 9,509 |
| 1950 | 12,279 |
| 1949 | 9,250 |
| 1948 | 8,549 |
| 1947 | 11,343 |
| 1946 | 9,600 |
| 1945 | 7,816 |
| 1944 | 6,094 |
| 1943 | 5,939 |
| 1942 | 10,600 |
| 1941 | 9,382 |
| 1940 | 11,062 |
| 1939 | 9,780 |
| 1938 | 10,430 |
| 1937 | 7,946 |
| 1936 | 8,190 |
| 1935 | 7,174 |
| 1934 | 6,821 |
| 1933 | 10,006 |
| 1932 | 8,228 |
| 1931 | 7,169 |
| 1930 | 8,345 |
| 1929 | 6,636 |
| 1928 | 6,442 |
| 1927 | 7,033 |
| 1926 | 6,553 |
| 1925 | 6,696 |
| 1924 | 6,811 |
| 1923 | 6,356 |
| 1922 | 4,702 |
| 1921 | 7,060 |
| 1920 | 7,746 |
| 1919 | 5,825 |
| 1918 | 5,397 |
| 1917 | 5,425 |
| 1916 | 5,650 |
| 1915 | 5,907 |
| 1914 | 5,067 |
| 1913 | 5,340 |
| 1912 | 5,124 |
| 1911 | 4,592 |
| 1910 | 3,754 |
| 1909 | 3,846 |
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Source
Release date
December 1993
Region
United States
Survey time period
1909 to 1988
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