Year	Tonnes
1950	212.686
1951	234.688
1952	267.691
1953	311.695
1954	337.364
1955	311.695
1956	341.031
1957	374.034
1958	319.029
1959	366.7
1960	432.706
1961	429.039
1962	495.045
1963	531.715
1964	605.055
1965	795.739
1966	1096.433
1967	1334.788
1968	1452.132
1969	1521.805
1970	1609.813
1971	1716.156
1972	1745.492
1973	2108.525
1974	1602.479
1975	2020.517
1976	1998.515
1977	1899.506
1978	2394.551
1979	2295.542
1980	2372.549
1981	2031.518
1982	1873.837
1983	1375.125
1984	1554.808
1985	1598.812
1986	1760.16
1987	1760.16
1988	1877.504
1989	1855.502
1990	1771.161
1991	2053.52
1992	2068.188
1993	2042.519
1994	2046.186
1995	2064.521
1996	2086.523
1997	2108.525
1998	2108.525
1999	2126.86
2000	2196.533
2001	2368.882
2002	1565.809
2003	1543.807
2004	1562.142
2005	1595.145
2006	1745.492
2007	1763.827
2008	1943.51
2009	2002.182
2010	2401.885
2011	1969.179
2012	2258.872
2013	1917.841
2014	1991.181