Year Production value ($) Imports Exports Apparent consumption Unit value ($/t) Unit value (98$/t) World production 1901 289000 1902 328000 1903 308000 1904 324000 1905 326000 1906 208000 1907 471000 1908 415000 1909 534000 1910 296000 1911 344000 1912 320000 1913 319000 1914 125000 1915 170000 1916 218000 1917 131000 1918 107000 1919 112000 0.16 0.16 519000000 4890000000 1920 265000 0.09 0.09 658000000 5360000000 1921 518000 0.06 0.06 490000000 4460000000 1922 0 0 1923 0 0 1924 0 0 1925 0 0 1926 0 0 1927 0 0 1928 0 0 1929 0.16 0.16 433000000 4130000000 1930 0.11 0.11 344000000 3360000000 1931 0.09 0.09 221000000 2370000000 1932 0.05 0.05 240000000 2860000000 1933 0.04 0.04 274000000 3430000000 1934 0.05 0.05 278000000 3380000000 1935 5000 0.08 0.08 266000000 3170000000 1936 12500 0.11 0.11 295000000 3460000000 1937 32000 0.12 0.12 341000000 3860000000 1938 127000 0.08 0.08 312000000 3610000000 1939 353000 0.14 0.14 276000000 3240000000 1940 545000 0.12 0.12 325000000 3780000000 1941 505000 0.1 0.1 354000000 3920000000 1942 150000 0.09 0.09 329000000 3290000000 1943 67000 0.19 0.19 379000000 3570000000 1944 41000 0.22 0.22 350000000 3240000000 0.47 1945 40000 0.28 0.28 414000000 3750000000 0.51 1946 325000 0.44 0.44 428000000 3580000000 0.56 1947 570000 0.27 0.27 405000000 2960000000 0.51 1948 450000 0.26 0.26 440000000 2970000000 0.45 1949 450000 0.21 0.21 394000000 2700000000 1950 450000 0.24 0.24 497000000 3360000000 1951 450000 0.23 0.23 555000000 3480000000 1952 450000 0.23 0.23 518000000 3190000000 1953 550000 0.24 0.24 535000000 3270000000 1954 650000 0.3 0.3 477000000 2890000000 1955 800000 0.36 0.36 482000000 2930000000 0.8 1956 925000 0.38 0.38 489000000 2930000000 0.97 1957 900000 0.33 0.33 513000000 2980000000 0.65 1958 1000000 0.38 0.38 440000000 2480000000 1.19 1959 1190000 0.52 0.52 411000000 2300000000 1.18 1960 1190000 0.45 0.45 428000000 2360000000 1.34 1961 1310000 0.8 0.8 278000000 1520000000 1.4 1962 1300000 0.76 0.76 297000000 1600000000 1.27 1963 1400000 0.81 0.81 315000000 1680000000 1.28 1964 1500000 0.81 0.81 369000000 1940000000 1.55 1965 2200000 1.18 1.18 308000000 1590000000 1.55 1966 2400000 1.28 1.28 333000000 1680000000 1.78 1967 2400000 1.45 1.45 303000000 1480000000 1.87 1968 2500000 1.96 1.96 274000000 1280000000 2.13 1969 2400000 1.98 1.98 286000000 1270000000 2.61 1970 2400000 2.39 0.33 2.39 203000000 853000000 2.66 1971 2600000 3.21 0.32 3.21 164000000 660000000 2.49 1972 2700000 4.61 0.36 4.61 155000000 605000000 2.54 1973 2700000 4.46 0.35 4.46 210000000 771000000 2.49 1974 4600000 2.94 0.29 2.94 299000000 988000000 2.34 1975 8700000 3.81 0.29 3.81 222000000 673000000 2.05 1976 8900000 5.08 0.3 5.08 231000000 662000000 1.86 1977 8900000 4.75 0.31 4.75 344000000 925000000 1.86 1978 8900000 5.04 0.32 5.04 440000000 1100000000 1.89 1979 8200000 5.39 0.24 5.39 402000000 903000000 2.05 1980 6900000 5.12 0.27 5.12 533000000 1050000000 2.09 1981 7600000 7.11 0.64 7.11 389000000 698000000 2.03 1982 7200000 7.6 0.54 7.6 313000000 529000000 2.05 1983 7400000 10.3 0.5 10.3 277000000 453000000 4.61 1984 7500000 14.7 0.46 14.7 248000000 389000000 5.22 1985 7400000 14.1 0.48 14.1 261000000 395000000 5.25 1986 9300000 16.7 0.51 16.7 250000000 372000000 8.41 1987 21400000 19.8 0.51 19.8 206000000 296000000 8.2 1988 42500000 19.9 0.43 19.9 254000000 350000000 9.84 1989 42900000 23.9 0.21 23.9 214000000 281000000 10.1 1990 52900000 26.1 0.24 26.1 176000000 220000000 10.5 1991 84400000 101 0.74 101 45800000 54800000 10.2 1992 66200000 129 0.39 129 37500000 43600000 11.4 1993 57700000 150 0.33 150 38500000 43400000 9.48 1994 50500000 236 0.32 236 27200000 29900000 10.6 1995 48700000 322 0.47 322 20700000 22100000 11.1 1996 43300000 364 0.42 364 19900000 20700000 11 1997 25000000 289 0.59 289 29000000 29500000 11.4 1998 14300000 238 0.68 238 38800000 38800000 12.1 1999 16100000 331 1.09 331 32400000 31700000 12.1 2000 17200000 291 3.26 291 44400000 42000000 13.4 2001 14900000 280 1.8 280 40400000 37200000 14.6 2002 12600000 221 2.86 221 58100000 52600000 15.3 2003 12500000 325 3.3 325 41100000 36400000 17.6 2004 14500000 284 4.52 284 53300000 46000000 17.7 2005 13400000 374 5.1490448 374 44800000 37400000 18.6 2006 11300000 500 6.5209556 500 35600000 28800000 18.8 2007 11900000 293 7.223615 293 66800000 52500000 18.5 2008 11500000 239.6292846 6.7945242 239.6292846 87100000 65900000 17.3 2009 9310000 241.624569 5.0452052 241.624569 56100000 42600000 15.1 2010 10000000 303.306322 4.744638 303.306322 64500000 48200000 14 2011 11000000 347.924 3.2048846 347.924 67600000 49000000 13.4 2012 11300000 444.7665248 2.8850992 444.7665248 48300000 34300000 13.4 2013 9570000 518.227893 2.9673998 518.227893 47800000 33400000 14.1 2014 9490000 645.5033848 2.8995762 645.5033848 40900000 28200000 14.2 2015 8540000 520.6929234 2.4333002 520.6929234 48300000 33200000 14.2