Year	Number
1970	157700
1971	174900
1972	184900
1973	201500
1974	232400
1975	242100
1976	284900
1977	311300
1978	341300
1979	341700
1980	353100
1981	361800
1982	357800
1983	389900
1984	394100
1985	382900
1986	389900
1987	381200
1988	406400
1989	414200
1990	415100
1991	385000
1992	441300
1993	467800
1994	491800
1995	483000
1996	519600
1997	545200
1998	535600
1999	571700
2000	613217
2001	665244
2002	621484
2003	683657
2004	701240
2005	590992
2006	648841
2007	707006
2008	680702
2009	1003079
2010	1267722.2842383632
2011	1292819.150162648
2012	1353694.091937992
2013	1427157.5
2014	1501061.1416163929
2015	1561886
2016	1691849
2017	1780821.4679999999
2018	1812409.753530167
2019	1844219.2719999999
2020	811860.4600000001
2021	1087594.114