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	1550
1993	5170
1994	8191
1995	8250
1996	8810
1997	12245
1998	16146
1999	27677
2000	32042
2001	147837
2002	486667
2003	675162
2004	1476000
2005	2277559
2006	2977781
2007	4349000
2008	6445000
2009	8313000
2010	11085000
2011	11668000
2012	13900000
2013	16844700
2014	17100000
2015	15021953
2016	16433055
2017	15357868
2018	15297789
2019	15238000
2020	15178000
2021	15178000