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	0
1997	2995
1998	7500
1999	17000
2000	50000
2001	95000
2002	165138
2003	243613
2004	332565
2005	433635
2006	708000
2007	1190319
2008	1549542
2009	2187334
2010	2602283
2011	2695335
2012	3312239
2013	4262993
2014	4516114
2015	4855206
2016	5505424
2017	6069905
2018	6144507
2019	6239183
2020	6516510
2021	6254789
2022	6564132