Year	Number
1970	219700
1971	220700
1972	229300
1973	244200
1974	226300
1975	261900
1976	278300
1977	284800
1978	292700
1979	349600
1980	359200
1981	354900
1982	348700
1983	364100
1984	391700
1985	363700
1986	362100
1987	357200
1988	374600
1989	380100
1990	335600
1991	318200
1992	370600
1993	314300
1994	325000
1995	282000
1996	291500
1997	294000
1998	283900
1999	336700
2000	356575
2001	444450
2002	380683
2003	320117
2004	349270
2005	375959
2006	405791
2007	394482
2008	408405
2009	404042
2010	488403.85218270496
2011	543909.4012380647
2012	519697.5005371599
2013	556736.09
2014	533306.4526301174
2015	523455
2016	528016
2017	536379.38
2018	544673.4445437407
2019	545738.122
2020	283689.11799999996
2021	371452.766