Year	kt
1960	311.695
1961	300.694
1962	352.032
1963	381.368
1964	381.368
1965	575.719
1966	748.068
1967	997.424
1968	1624.481
1969	1554.808
1970	1562.142
1971	1745.492
1972	1312.786
1973	1690.487
1974	1679.486
1975	1136.77
1976	1103.767
1977	1012.092
1978	1327.454
1979	1800.497
1980	1767.494
1981	1800.497
1982	1408.128
1983	1760.16
1984	1543.807
1985	1690.487
1986	2079.189
1987	2405.552
1988	2471.558
1989	2640.24
1990	2849.259
1991	2841.925
1992	2816.256
1993	2852.926
1994	2009.516
1995	2258.872
1996	2515.562
1997	2676.91
1998	2845.592
1999	2838.258
2000	3109.616
2001	3905.355
2002	4074.037
2003	4422.402
2004	4638.755
2005	4338.061
2006	4642.422
2007	5214.474
2008	5676.516
2009	5720.52
2010	5577.507
2011	5647.18
2012	6153.226
2013	7396.339
2014	8654.12
2015	8885.141
2016	9556.202