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	570
1992	2498
1993	7224
1994	13774
1995	30452
1996	69500
1997	144200
1998	247000
1999	387000
2000	557000
2001	651200
2002	881000
2003	1050241
2004	1255731
2005	1445300
2006	1658700
2007	1681849
2008	1624465
2009	1570538
2010	1652809
2011	1806075
2012	1999750
2013	1927423
2014	1897551
2015	1903545
2016	1897921
2017	1904425