Year	Total
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	0
1996	2200
1997	3800
1998	8600
1999	13000
2000	23000
2001	103846
2002	190778
2003	527233
2004	1048558
2005	1827940
2006	4683127
2007	8218092
2008	11991469
2009	15339895
2010	18093231
2011	25056185
2012	27658595
2013	27657875
2014	27796611
2015	27938507
2016	27807293
2017	28644139