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	1500
1993	3390
1994	7660
1995	15807
1996	32860
1997	84240
1998	231520
1999	435611
2000	820810
2001	1150000
2002	1667018
2003	1770345
2004	1749048
2005	1887000
2006	3232842
2007	4694361
2008	5790759
2009	5618639
2010	5920858
2011	6529053
2012	6793703
2013	7053297
2014	7305277
2015	7411986
2016	7489474
2017	7468275
2018	7439692
2019	7761848
2020	7865050
2021	7975074
2022	8659347