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	13549
1997	36000
1998	91212
1999	257134
2000	472952
2001	728545
2002	1027058
2003	1280696
2004	1674332
2005	2349439
2006	4065421
2007	7467708
2008	10449036
2009	13184308
2010	15599044
2011	17344242
2012	18099532
2013	19390902
2014	22104575
2015	25407610
2016	27451250
2017	31747233
2018	33807850
2019	37376603
2020	40095246
2021	44561505
2022	49006419