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	3500
1996	6644
1997	12500
1998	19500
1999	30000
2000	82000
2001	106600
2002	150000
2003	223671
2004	286095
2005	448857
2006	608846
2007	800270
2008	1052000
2009	1631576
2010	1950072
2011	2194495
2012	2146833
2013	2727913
2014	2670983
2015	2549817
2016	2659951
2017	2680196
2018	2759293
2019	2823655
2020	2898125
2021	2915307
2022	2905781