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	0
1994	0
1995	1747
1996	4000
1997	5000
1998	30000
1999	56358
2000	126913
2001	283520
2002	393310
2003	776169
2004	1165035
2005	1315300
2006	2008818
2007	4195278
2008	8554864
2009	9383734
2010	12828264
2011	16696992
2012	16356387
2013	18068648
2014	20365941
2015	20220273
2016	22838486
2017	24948878
2018	24472033
2019	25395503
2020	27688987
2021	30127704
2022	33068233