Year	Tonnes
1970	14601.994
1971	16677.516
1972	17913.295
1973	17513.592
1974	19050.065
1975	19446.101
1976	23894.172
1977	22610.722
1978	23237.779
1979	27278.813
1980	27997.545
1981	30824.802
1982	30571.779
1983	37971.785
1984	34697.154
1985	36237.294
1986	39984.968
1987	40762.372
1988	42724.217
1989	49882.201
1990	56592.811
1991	68591.235
1992	75298.178
1993	91722.671
1994	94010.879
1995	121132.011
1996	125374.73
1997	124821.013
1998	114186.713
1999	107934.478
2000	125734.096
2001	135620.328
2002	133742.824
2003	158256.719
2004	163826.892
2005	174486.861
2006	167702.911
2007	184816.8
2008	204031.88
2009	198876.078
2010	218476.193
2011	220405.035
2012	218707.214
2013	236510.499
2014	242821.406