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	120000
1996	198000
1997	373900
1998	505300
1999	627000
2000	743000
2001	766754
2002	775104
2003	795460
2004	884445
2005	993557
2006	1106431
2007	1260000
2008	1427000
2009	2390317
2010	2863664
2011	3456650
2012	3755169
2013	3884757
2014	4387275
2015	4657651
2016	4277043
2017	4399085
2018	4424185
2019	4237962
2020	4288221
2021	4288221