Year	kt
1960	861.745
1961	887.414
1962	564.718
1963	619.723
1964	1100.1
1965	1232.112
1966	1510.804
1967	1474.134
1968	1840.834
1969	1558.475
1970	2394.551
1971	2420.22
1972	1705.155
1973	2599.903
1974	2783.253
1975	2530.23
1976	2390.884
1977	2141.528
1978	1543.807
1979	1642.816
1980	2002.182
1981	1393.46
1982	1265.115
1983	1155.105
1984	1206.443
1985	1455.799
1986	1404.461
1987	1459.466
1988	1507.137
1989	1646.483
1990	1584.144
1991	1767.494
1992	1584.144
1993	1837.167
1994	1980.18
1995	2075.522
1996	2196.533
1997	1829.833
1998	1811.498
1999	2057.187
2000	2233.203
2001	1888.505
2002	2405.552
2003	2739.249
2004	2530.23
2005	2823.59
2006	2720.914
2007	2944.601
2008	2867.594
2009	2973.937
2010	3542.322
2011	3648.665
2012	3630.33
2013	4242.719
2014	4290.39