Year	kt
1960	4202.382
1961	7044.306999999999
1962	9948.570999999998
1963	4195.047999999998
1964	8320.422999999997
1965	9387.519999999997
1966	8764.13
1967	10447.282999999998
1968	10238.263999999997
1969	10986.331999999997
1970	14590.992999999995
1971	18907.051999999996
1972	19475.436999999994
1973	23930.841999999997
1974	21979.997999999992
1975	24191.199
1976	26571.082
1977	29812.710000000003
1978	27704.184999999998
1979	27432.827000000005
1980	27220.141
1981	21671.97
1982	18070.976000000002
1983	14051.944000000003
1984	13960.269000000002
1985	14323.302000000001
1986	12999.515000000005
1987	14125.284000000001
1988	13842.925000000001
1989	15581.083000000002
1990	17458.587000000003
1991	17854.623000000007
1992	19057.399
1993	18888.717000000004
1994	18268.994000000002
1995	19460.769000000004
1996	21026.578000000005
1997	19431.433000000005
1998	19926.478000000003
1999	21785.647000000004
2000	22119.344000000005
2001	22240.355000000003
2002	21110.919000000005
2003	22280.692
2004	21572.961
2005	22005.667
2006	23164.439000000002
2007	22794.071999999996
2008	24117.859
2009	21466.618000000002
2010	22313.695
2011	21242.931
2012	21026.578
2013	22885.747
2014	21110.919
2015	21114.586
2016	22504.378999999994