Year	kt
1960	4546.652443103144
1961	4281.2262464246905
1962	3455.4558567583895
1963	3445.6252568814093
1964	4517.160643472204
1965	4035.4612495001966
1966	4223.3871410210395
1967	4891.018597739821
1968	4792.210141219825
1969	5982.852042285782
1970	6813.529020057694
1971	6492.136141753085
1972	8068.233119849915
1973	8463.73474337197
1974	9852.934195993188
1975	12260.550329183694
1976	10021.022385990062
1977	10218.773197751088
1978	9788.665182170855
1979	9843.046655405135
1980	10559.89334803886
1981	11987.974385747439
1982	14073.269188214632
1983	14755.66945103038
1984	16174.86420050951
1985	15517.188584897227
1986	17979.76344636276
1987	19339.619042553557
1988	18909.410181213196
1989	18850.055506304863
1990	18221.885196858333
1991	19428.763586661113
1992	17326.618850324307
1993	19626.61250302223
1994	21228.190674633835
1995	20335.189512280696
1996	23582.025260184233
1997	22480.33360880291
1998	25292.804040846317
1999	24875.062318642977
2000	28182.993863067088
2001	29863.67567565261
2002	31898.95220592236
2003	31617.219416529417
2004	32313.65539566739
2005	34709.784778435795
2006	35654.60002286074
2007	37344.55306314658
2008	35031.21676880717
2009	29888.975347708056
2010	33121.6568065894
2011	27279.787712946538
2012	25835.592165165748
2013	24808.177882851895
2014	29601.826920073367
2015	31239.927704332018
2016	29558.324317669718