Year	Tonnes
1959	47671
1960	168682
1961	286026
1962	425372
1963	601388
1964	777404
1965	975422
1966	1166106
1967	1389793
1968	1587811
1969	1749159
1970	1950844
1971	2178198
1972	2423887
1973	2691578
1974	2995939
1975	3336970
1976	3678001
1977	4092372
1978	4488408
1979	4917447
1980	5309816
1981	5705852
1982	6072552
1983	6490590
1984	6926963
1985	7334000
1986	7715368
1987	8074734
1988	8459769
1989	8877807
1990	9299512
1991	9735885
1992	10179592
1993	10634300
1994	11096342
1995	11565718
1996	12053429
1997	12577810
1998	13340546
1999	14136285
2000	14957693
2001	15786435
2002	16633512
2003	17476922
2004	18353335
2005	19251750
2006	20194169
2007	21202594
2008	22273358
2009	23080098
2010	24044519
2011	25089614
2012	26083371
2013	27110131
2014	28521926