Year	Tonnes
1950	1628.148
1951	1547.474
1952	1939.843
1953	2068.188
1954	1785.829
1955	1664.818
1956	1419.129
1957	2321.211
1958	1950.844
1959	2057.187
1960	2258.872
1961	2335.879
1962	2563.233
1963	2533.897
1964	2273.54
1965	2658.575
1966	2662.242
1967	2948.268
1968	3241.628
1969	4319.726
1970	3597.327
1971	3197.624
1972	3542.322
1973	3689.002
1974	2933.6
1975	2896.93
1976	2805.255
1977	2918.932
1978	3450.647
1979	3828.348
1980	3410.31
1981	4033.7
1982	4499.409
1983	4884.444
1984	3883.353
1985	3956.693
1986	3703.67
1987	4074.037
1988	3490.984
1989	3483.65
1990	3868.685
1991	4176.713
1992	5185.138
1993	5042.125
1994	5526.169
1995	5903.87
1996	7062.642
1997	7616.359
1998	7825.378
1999	8617.45
2000	10238.264
2001	10443.616
2002	11056.005
2003	11078.007
2004	12299.118
2005	12101.1
2006	11976.422
2007	12354.123
2008	12207.443
2009	13175.531
2010	13263.539
2011	15137.376
2012	16032.124
2013	15489.408
2014	18393.672