Year	Tonnes
1948	22.002
1949	25.669
1950	517.047
1951	553.717
1952	718.732
1953	715.065
1954	634.391
1955	711.398
1956	634.391
1957	762.736
1958	927.751
1959	993.757
1960	997.424
1961	1103.767
1962	1191.775
1963	1184.441
1964	1243.113
1965	1529.139
1966	1657.484
1967	1697.821
1968	2020.517
1969	2053.52
1970	2203.867
1971	2603.57
1972	2801.588
1973	3241.628
1974	3021.608
1975	3663.333
1976	3611.995
1977	3461.648
1978	2841.925
1979	3193.957
1980	3124.284
1981	3340.637
1982	3292.966
1983	3494.651
1984	2882.262
1985	2629.239
1986	2753.917
1987	3201.291
1988	2929.933
1989	2522.896
1990	2768.585
1991	3245.295
1992	4246.386
1993	3942.025
1994	4338.061
1995	2984.938
1996	4624.087
1997	5647.18
1998	5947.874
1999	5669.182
2000	5790.193
2001	7007.637
2002	5870.867
2003	6153.226
2004	5804.861
2005	6838.955
2006	7370.67
2007	7198.321
2008	7374.337
2009	8599.115
2010	9163.833
2011	10098.918
2012	10113.586
2013	10718.641
2014	8800.8