Year	Tonnes
1958	165015
1959	322696
1960	733400
1961	1349456
1962	2009516
1963	2706246
1964	3406643
1965	4103373
1966	4822105
1967	5548171
1968	6296239
1969	7044307
1970	7836379
1971	8650453
1972	9482862
1973	10285935
1974	11125678
1975	11969088
1976	12856502
1977	13758584
1978	14660666
1979	15606752
1980	16571173
1981	17561263
1982	18544019
1983	19497439
1984	20476528
1985	21470285
1986	22467709
1987	23461466
1988	24488226
1989	25533321
1990	26538079
1991	27564839
1992	28624602
1993	29713701
1994	30964148
1995	32254932
1996	33619056
1997	35038185
1998	36541655
1999	38122132
2000	39764948
2001	41484771
2002	43288935
2003	45170106
2004	47113616
2005	48939782
2006	50831954
2007	52801133
2008	54990332
2009	57252871
2010	59856441
2011	62636027
2012	65217595
2013	67516804
2014	69966360