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	3260
1987	6720
1988	9573
1989	13492
1990	24357
1991	36402
1992	53074
1993	77205
1994	116396
1995	212606
1996	334285
1997	505060
1998	759063
1999	1209407
2000	1938894
2001	2782974
2002	3608845
2003	4654160
2004	6278104
2005	7493407
2006	8960708
2007	10989039
2008	12726637
2009	13851233
2010	14935463
2011	15853227
2012	17091443
2013	17808156
2014	19173349
2015	19905375
2016	21211492
2017	21095004
2018	20119054
2019	21138245
2020	21212872
2021	22051188
2022	19683213