Year	kt
1960	2028021.471730693
1961	1771427.9991160242
1962	1653689.956974319
1963	1695684.6723825948
1964	1739447.7357701198
1965	1824484.4510220273
1966	1906497.328681372
1967	1831826.0065956255
1968	1860685.4112893594
1969	1982808.4828721362
1970	2236530.572519582
1971	2351612.5491261594
1972	2437530.6368229007
1973	2469006.4703242914
1974	2472351.302764506
1975	2666754.426459802
1976	2719035.0993966083
1977	2852571.4688722966
1978	2985127.786657793
1979	3052516.216239186
1980	3113627.035233551
1981	3001740.0470717284
1982	3182527.8956601154
1983	3271273.4201486525
1984	3446880.0120663447
1985	3821686.397848346
1986	3960065.245162084
1987	4104658.7364487518
1988	4262527.30255803
1989	4213575.964265491
1990	4009216.6297901045
1991	3959827.604617736
1992	3478903.236429518
1993	3543602.0707107238
1994	3659238.631960246
1995	3841558.8302832805
1996	3952476.7645109035
1997	3851883.186207201
1998	3647622.458969185
1999	3604822.4123575552
2000	3648599.7507453747
2001	3668414.1207719045
2002	4025714.0708676158
2003	4658443.028528967
2004	5237971.088935544
2005	5840004.580354294
2006	6388980.528382185
2007	6477235.914169581
2008	7322040.768988778
2009	7084162.35770106
2010	8143060.728869833
2011	8952570.795737376
2012	9153990.9751827
2013	9139832.623037878
2014	9077652.533037456
2015	8939217.729700573
2016	8628448.919042185