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	800
1994	2775
1995	9068
1996	17000
1997	201000
1998	643000
1999	1355500
2000	2499000
2001	3845116
2002	5110591
2003	7039898
2004	10215388
2005	13354138
2006	15991000
2007	20400000
2008	24470000
2009	25100000
2010	24360000
2011	23420000
2012	22840000
2013	22910000
2014	22920000
2015	23120000
2016	22900000
2017	22400000
2018	22634000
2019	22671000
2020	22588000
2021	22929000
2022	23219000