Year	kt
1971	3.667
1972	3.667
1973	3.667
1974	3.667
1975	7.334
1976	11.001
1977	14.668
1978	22.002
1979	29.336
1980	44.004
1981	47.671
1982	47.671
1983	51.338
1984	58.672
1985	66.006
1986	80.674
1987	80.674
1988	95.342
1989	124.678
1990	172.349
1991	154.014
1992	231.021
1993	198.018
1994	198.018
1995	249.356
1996	289.693
1997	330.03
1998	300.694
1999	421.705
2000	451.041
2001	462.042
2002	594.054
2003	506.046
2004	667.394
2005	601.388
2006	759.069
2007	781.071
2008	843.41
2009	883.747
2010	935.085
2011	986.423
2012	1111.101
2013	1092.766
2014	1316.453
2015	1301.785
2016	1444.798