Year	Tonnes
1950	106.343
1951	139.346
1952	143.013
1953	209.019
1954	220.02
1955	264.024
1956	264.024
1957	278.692
1958	293.36
1959	414.371
1960	421.705
1961	407.037
1962	429.039
1963	432.706
1964	491.378
1965	627.057
1966	733.4
1967	810.407
1968	982.756
1969	1177.107
1970	1444.798
1971	1441.131
1972	1382.459
1973	1180.774
1974	1195.442
1975	1133.103
1976	990.09
1977	806.74
1978	700.397
1979	674.728
1980	627.057
1981	528.048
1982	546.383
1983	616.056
1984	583.053
1985	619.723
1986	704.064
1987	770.07
1988	865.412
1989	803.073
1990	759.069
1991	781.071
1992	788.405
1993	781.071
1994	707.731
1995	938.752
1996	1059.763
1997	1107.434
1998	1265.115
1999	1312.786
2000	1430.13
2001	1510.804
2002	1558.475
2003	1598.812
2004	1738.158
2005	2170.864
2006	2537.564
2007	2889.596
2008	3190.29
2009	3380.974
2010	3920.023
2011	4264.721
2012	4070.37
2013	4869.776
2014	5229.142