Year	Tonnes
1959	62339
1960	117344
1961	168682
1962	253023
1963	344698
1964	443707
1965	550050
1966	634391
1967	751735
1968	876413
1969	1037761
1970	1162439
1971	1312786
1972	1433797
1973	1595145
1974	1745492
1975	1928842
1976	2112192
1977	2310210
1978	2504561
1979	2706246
1980	2915265
1981	3124284
1982	3329636
1983	3534988
1984	3751341
1985	3931024
1986	4118041
1987	4316059
1988	4382065
1989	4484741
1990	4627754
1991	4693760
1992	4778101
1993	4869776
1994	4972452
1995	5082462
1996	5207140
1997	5350153
1998	5500500
1999	5661848
2000	5837864
2001	6010213
2002	6178895
2003	6560263
2004	6937964
2005	7337667
2006	7744704
2007	8206746
2008	8716459
2009	9207837
2010	9724884
2011	10263933
2012	10876322
2013	11576719
2014	12306452