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	2195
1993	15699
1994	38942
1995	75000
1996	216900
1997	812200
1998	1928042
1999	3956500
2000	6747000
2001	10004661
2002	13898471
2003	17401222
2004	23096065
2005	29166391
2006	36745454
2007	41388774
2008	43926365
2009	44806632
2010	46952111
2011	50160222
2012	54086209
2013	56972803
2014	56905306
2015	54537230
2016	53001776
2017	50458854
2018	48285544
2019	48392944
2020	49350724
2021	50588734
2022	52589287