Year	Tonnes
1950	260.357
1951	286.026
1952	337.364
1953	451.041
1954	473.043
1955	517.047
1956	550.05
1957	535.382
1958	458.375
1959	553.717
1960	660.06
1961	737.067
1962	678.395
1963	616.056
1964	649.059
1965	1078.098
1966	1180.774
1967	1323.787
1968	1331.121
1969	1367.791
1970	1580.477
1971	1499.803
1972	1562.142
1973	1804.164
1974	1554.808
1975	1826.166
1976	1752.826
1977	1899.506
1978	2057.187
1979	1521.805
1980	1789.496
1981	1800.497
1982	1404.461
1983	1246.78
1984	1404.461
1985	1419.129
1986	1045.095
1987	1309.119
1988	1404.461
1989	1184.441
1990	1133.103
1991	1114.768
1992	1045.095
1993	1045.095
1994	1386.126
1995	1463.133
1996	1518.138
1997	1591.478
1998	1657.484
1999	1679.486
2000	1609.813
2001	1595.145
2002	1580.477
2003	1565.809
2004	1628.148
2005	1437.464
2006	1290.784
2007	1562.142
2008	1558.475
2009	1565.809
2010	1719.823
2011	1782.162
2012	1994.848
2013	1936.176
2014	2009.516