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	2200
1991	2500
1992	2912
1993	4037
1994	5706
1995	11735
1996	20843
1997	42515
1998	60448
1999	102119
2000	180000
2001	272416
2002	347532
2003	462405
2004	547745
2005	656828
2006	772395
2007	928622
2008	1033300
2009	1086748
2010	1190900
2011	1294100
2012	1485800
2013	1533600
2014	1652000
2015	1762300
2016	1814000
2017	1839500
2018	1918000
2019	1866600
2020	1912900
2021	1971300
2022	2096800