Year	Number
1970	4293500
1971	4830800
1972	5380800
1973	6018800
1974	6572200
1975	7788200
1976	9502900
1977	10807400
1978	11927200
1979	13205700
1980	14837000
1981	15712200
1982	16017600
1983	16043200
1984	14980500
1985	15874800
1986	16257900
1987	16423100
1988	18809400
1989	19924600
1990	17110900
1991	16253700
1992	21066700
1993	16134800
1994	14243900
1995	13230400
1996	13385700
1997	13161200
1998	12828900
1999	13668700
2000	13644350
2001	18495379
2002	16191622
2003	13756737
2004	16934120
2005	17404468
2006	19959287
2007	20199039
2008	22723429
2009	22127432
2010	33183814.054482583
2011	39379075.22660813
2012	38732387.24388399
2013	38896500.17335996
2014	40338413.27323723
2015	39233518
2016	39962744
2017	41551466.05
2018	48929733.440362394
2019	48048008.9975303
2020	18073886.216
2021	25439426.874