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	204
1993	457
1994	812
1995	1442
1996	3096
1997	4734
1998	5048
1999	5307
2000	5600
2001	55085
2002	100000
2003	149300
2004	175000
2005	247478
2006	404345
2007	800371
2008	1166136
2009	1312874
2010	1478347
2011	1401163
2012	1526191
2013	1848854
2014	2283691
2015	2715672
2016	2838127
2017	2966000
2018	3181393
2019	2584714
2020	2677954
2021	2677954