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	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	20000
2005	40438
2006	61996
2007	84348
2008	108631
2009	141130
2010	185275
2011	241939
2012	305283
2013	354844
2014	417400
2015	475000
2016	506000
2017	695000
2019	1311000
2020	1801000
2021	1801000