Year	kt
1960	2351678.629486628
1961	2080680.8870285077
1962	1966356.566473921
1963	2021137.059627513
1964	2064604.7111113162
1965	2169475.492609178
1966	2259587.0375512647
1967	2178504.847183101
1968	2217020.5791474152
1969	2349819.975088395
1970	2627344.7435928416
1971	2755568.679684748
1972	2850342.932756406
1973	2892987.157482583
1974	2909610.002505071
1975	3146734.839046548
1976	3213755.550438305
1977	3371140.0464925445
1978	3511224.7142068907
1979	3593882.8297790107
1980	3684914.9592068065
1981	3581445.207827836
1982	3784885.649596792
1983	3909584.960824997
1984	4100968.9832269764
1985	4544673.193542446
1986	4730601.784954813
1987	4919947.92833301
1988	5122896.778820321
1989	5090221.267584584
1990	4909370.910582686
1991	4902388.378634164
1992	4400569.984219384
1993	4456434.844264886
1994	4549178.359780345
1995	4746904.52848758
1996	4876601.998969624
1997	4763374.714693521
1998	4560199.311911918
1999	4567539.795801365
2000	4643107.296528427
2001	4691567.860684289
2002	5081828.918307768
2003	5773910.141246809
2004	6415820.253759243
2005	7106031.659705804
2006	7761180.252062222
2007	7950202.708057797
2008	8929219.837916786
2009	8747092.606052967
2010	9802732.335901206
2011	10824972.640826276
2012	11220020.449225783
2013	11062809.54307165
2014	11113868.424924875
2015	11099565.81819081
2016	10892197.032110617