Year	kt
1960	9515.865
1961	9893.566
1962	10267.6
1963	11573.052
1964	12497.136
1965	12273.449
1966	15372.064
1967	15060.369
1968	16820.529
1969	17374.246
1970	23116.768
1971	22156.014
1972	23919.841
1973	25419.644
1974	21994.666
1975	24044.519
1976	23025.093
1977	25166.621
1978	26490.408
1979	27275.146
1980	28906.961
1981	28008.546
1982	28147.892
1983	26479.407
1984	27018.456
1985	27025.79
1986	28760.281
1987	29552.353
1988	27715.186
1989	32317.271
1990	21928.66
1991	23347.789
1992	20395.854
1993	22060.672
1994	19669.788
1995	19948.48
1996	20978.907
1997	21525.29
1998	22049.671
1999	23439.464
2000	23817.165
2001	22225.687
2002	23380.792
2003	28584.265
2004	28100.221
2005	28386.247
2006	30593.781
2007	27938.873
2008	33219.353
2009	35676.243
2010	30311.422
2011	25580.992
2012	27014.789
2013	30267.418
2014	29526.684
2015	28045.216
2016	23373.458