Year	Number
1970	283300
1971	288000
1972	283800
1973	256500
1974	18700
1975	18700
1976	29300
1977	246600
1978	259100
1979	259000
1980	257700
1981	230800
1982	222700
1983	230500
1984	214200
1985	238600
1986	266600
1987	283300
1988	294400
1989	230300
1990	255900
1991	283600
1992	324600
1993	347700
1994	405600
1995	396100
1996	371200
1997	394500
1998	378200
1999	384800
2000	382514
2001	388734
2002	536867
2003	529648
2004	324939
2005	342509
2006	352909
2007	353546
2008	393363
2009	403256
2010	572906
2011	593145.002471011
2012	622917
2013	641451
2014	664970
2015	668961
2016	682937
2017	672349
2018	665384
2019	684170
2020	310837
2021	383008