Year	Number
1970	152300
1971	160400
1972	157100
1973	155800
1974	150400
1975	173500
1976	193500
1977	161800
1978	170300
1979	188200
1980	204800
1981	211800
1982	206700
1983	208000
1984	207500
1985	211900
1986	195400
1987	203000
1988	202200
1989	220100
1990	232100
1991	227200
1992	220400
1993	233800
1994	233400
1995	212500
1996	231500
1997	259600
1998	253900
1999	268400
2000	282913
2001	288922
2002	267907
2003	289028
2004	300359
2005	321298
2006	319498
2007	359120
2008	318638
2009	327145
2010	470912.30005113594
2011	500629.94659704197
2012	514462.2894371635
2013	548834.772
2014	534810.3034944466
2015	556341
2016	562927
2017	630147
2018	705127.484622134
2019	717795.3
2020	286064.19739999995
2021	399895.84800000006