Year	Number
1960	0
1965	0
1970	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	40
1986	292
1987	375
1988	542
1989	665
1990	824
1991	1139
1992	1120
1993	5082
1994	12895
1995	26838
1996	45000
1997	67208
1998	130500
1999	209190
2000	303274
2001	409064
2002	473000
2003	539000
2004	470000
2005	510000
2006	713000
2007	684500
2008	707000
2009	720000
2010	727000
2011	764973
2012	761314
2013	788371
2014	802400
2015	806800
2016	764000
2017	794000
2018	798600
2019	817810
2020	838120
2021	876350