Year	Tonnes
1950	143.013
1951	168.682
1952	165.015
1953	249.356
1954	300.694
1955	429.039
1956	330.03
1957	311.695
1958	352.032
1959	432.706
1960	693.063
1961	1195.442
1962	1048.762
1963	1463.133
1964	663.727
1965	1015.759
1966	2629.239
1967	18507.349
1968	30139.073
1969	35551.565
1970	32331.939
1971	21646.301
1972	15232.718
1973	14587.326
1974	9347.183
1975	11580.386
1976	17916.962
1977	20106.161
1978	21239.264
1979	26032.033
1980	26904.779
1981	28811.619
1982	30762.463
1983	30414.098
1984	28624.602
1985	31418.856
1986	34059.096
1987	32566.627
1988	36398.642
1989	37322.726
1990	36780.01
1991	42863.563
1992	37260.387
1993	38947.207
1994	44132.345
1995	46020.85
1996	44158.014
1997	44975.755
1998	45474.467
1999	44620.056
2000	47113.616
2001	48100.039
2002	47832.348
2003	49167.136
2004	50358.911
2005	52108.07
2006	53270.509
2007	49959.208
2008	56013.425
2009	57978.937
2010	61961.299
2011	39702.609
2012	52683.789
2013	56266.448
2014	56996.181