Year	Number
1970	2966600
1971	3107300
1972	3962000
1973	4589600
1974	5501500
1975	6522900
1976	7675700
1977	8238200
1978	9387700
1979	11381500
1980	12889800
1981	13853300
1982	12777300
1983	13923500
1984	14440200
1985	15364400
1986	13824500
1987	13504900
1988	11412300
1989	12689000
1990	14341300
1991	14901000
1992	15532200
1993	16484800
1994	18791400
1995	14968800
1996	14677700
1997	17266500
1998	17717400
1999	20561100
2000	20894205
2001	20172824
2002	19618662
2003	20661206
2004	21167881
2005	21857658
2006	21243010
2007	20952513
2008	18825976
2009	15728171
2010	31269061
2011	29538937
2012	32909408.724554
2013	35986501.817
2014	39570522
2015	46966763
2016	53313307
2017	58537832
2018	64569640
2019	69937838
2020	34133108
2021	54217876