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	0
1996	1262
1997	3500
1998	9831
1999	12000
2000	21600
2001	57000
2002	137953
2003	125950
2004	196213
2005	249786
2006	357913
2007	482455
2008	593216
2009	661000
2010	987448
2011	1232354
2012	1544815
2013	1790295
2014	2138789
2015	2140141
2016	2282917
2017	2380804
2018	1582141
2019	1681633
2020	1562648
2021	1821374
2022	1556844