Year	Number
1970	4585300
1971	5013400
1972	5360200
1973	6261300
1974	6811800
1975	7320600
1976	8580400
1977	8761000
1978	9739500
1979	11291300
1980	13019500
1981	14210700
1982	14279000
1983	14397500
1984	14786200
1985	15179600
1986	14090900
1987	14322400
1988	14862300
1989	14713200
1990	14808400
1991	14208800
1992	13512500
1993	13923000
1994	14942600
1995	15368600
1996	16034300
1997	16477400
1998	16242300
1999	17122000
2000	17912857
2001	17173516
2002	16535011
2003	17883529
2004	20167567
2005	23620094
2006	25775571
2007	27232504
2008	28096606
2009	27748907
2010	38191509.13790186
2011	42648276.40103399
2012	45408840.802368455
2013	43790341.818
2014	44380996.11509803
2015	47850992
2016	49683303
2017	54260831.08
2018	64951730.360006236
2019	66236333.92023504
2020	24494981.601999998
2021	31483072.692000005