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	825
1996	2060
1997	5198
1998	13040
1999	25450
2000	49948
2001	67917
2002	80000
2003	97113
2004	116443
2005	134265
2006	155000
2007	176350
2008	196474
2009	209595
2010	220811
2011	227310
2012	231000
2013	240500
2014	243100
2015	260277
2019	260000
2020	260000
2021	260000