Year	Tonnes
1950	172.349
1951	161.348
1952	194.351
1953	212.686
1954	253.023
1955	381.368
1956	451.041
1957	495.045
1958	524.381
1959	656.393
1960	744.401
1961	979.089
1962	1048.762
1963	1221.111
1964	1243.113
1965	1422.796
1966	1584.144
1967	1415.462
1968	1507.137
1969	1760.16
1970	1558.475
1971	1657.484
1972	1917.841
1973	2203.867
1974	2229.536
1975	2493.56
1976	2951.935
1977	3164.621
1978	3641.331
1979	3795.345
1980	4726.763
1981	5863.533
1982	6292.572
1983	7363.336
1984	8353.426
1985	8540.443
1986	9281.177
1987	9662.545
1988	9314.18
1989	9233.506
1990	10403.279
1991	9798.224
1992	12266.115
1993	12101.1
1994	13633.906
1995	13556.899
1996	14187.623
1997	14418.644
1998	14543.322
1999	14568.991
2000	15507.743
2001	16002.788
2002	16886.535
2003	17469.588
2004	19240.749
2005	21059.581
2006	21121.92
2007	22035.003
2008	21349.274
2009	21891.99
2010	21180.592
2011	21668.303
2012	24444.222
2013	24389.217
2014	26450.071