Year	Number
1970	6743700
1971	7644100
1972	7462200
1973	8189900
1974	8631400
1975	8360600
1976	8238100
1977	9424100
1978	9507000
1979	9462500
1980	9955800
1981	10493300
1982	11611000
1983	11996600
1984	12593600
1985	14408000
1986	13811100
1987	15268100
1988	15649200
1989	17437700
1990	19750000
1991	18846800
1992	21766700
1993	21901400
1994	22959300
1995	23665800
1996	25838500
1997	28183900
1998	27462700
1999	28281000
2000	30418137
2001	31031074
2002	28244627
2003	36345771
2004	35922093
2005	36115764
2006	36709131
2007	37830745
2008	30672048
2009	33194501
2010	32645164
2011	33923370.5051058
2012	31072962.155732
2013	27846220
2014	27193939
2015	28603919
2016	29120041
2017	26288001
2018	27243741
2019	27760301
2020	7801490
2021	2449339