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	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	48000
1994	153000
1995	273000
1996	532000
1997	937700
1998	2047000
1999	3904000
2000	5932403
2001	7963742
2002	9314260
2003	8936202
2004	9324335
2005	10260396
2006	10979826
2007	12294912
2008	13799340
2009	13295093
2010	12292716
2011	12127985
2012	13360280
2013	12518645
2014	12144598
2015	12566649
2016	12538927
2017	12937106
2018	12170757
2019	11882081
2020	11412995
2021	11494008
2022	11326179