Year	Tonnes
1950	55.005
1951	80.674
1952	91.675
1953	91.675
1954	91.675
1955	113.677
1956	117.344
1957	161.348
1958	143.013
1959	165.015
1960	168.682
1961	172.349
1962	172.349
1963	209.019
1964	234.688
1965	245.689
1966	271.358
1967	297.027
1968	308.028
1969	330.03
1970	363.033
1971	535.382
1972	784.738
1973	949.753
1974	1041.428
1975	902.082
1976	850.744
1977	854.411
1978	729.733
1979	711.398
1980	781.071
1981	788.405
1982	902.082
1983	1026.76
1984	1481.468
1985	1210.11
1986	1371.458
1987	1642.816
1988	1730.824
1989	1521.805
1990	1609.813
1991	1400.794
1992	1595.145
1993	1584.144
1994	1635.482
1995	1639.149
1996	1639.149
1997	1631.815
1998	1628.148
1999	1631.815
2000	1741.825
2001	1818.832
2002	1785.829
2003	1998.515
2004	2071.855
2005	2203.867
2006	2126.86
2007	1932.509
2008	1873.837
2009	2027.851
2010	2009.516
2011	2218.535
2012	2214.868
2013	2211.201
2014	2299.209