Year	Number
1970	6347400
1971	7505400
1972	8654900
1973	9964000
1974	10198100
1975	10959100
1976	11801100
1977	13328200
1978	15369000
1979	15683000
1980	15089000
1981	14601800
1982	14637600
1983	14538000
1984	14283900
1985	14850700
1986	15403500
1987	16553300
1988	18983200
1989	20270300
1990	21652000
1991	20944600
1992	23385800
1993	22279400
1994	22361300
1995	25765700
1996	27759200
1997	30315700
1998	31594100
1999	33559400
2000	39711776
2001	41469789
2002	40380629
2003	42506835
2004	45539952
2005	49855007
2006	53122464
2007	60664991
2008	55213716
2009	49289158
2010	52847712.6083233
2011	52736140.9250126
2012	48089178.327112
2013	48056735.818
2014	53069339
2015	60564041
2016	66674868
2017	71598374
2018	80706703
2019	88237165.272
2020	26557077.999
2021	43440479.727