Year	Number
1970	84600
1971	86500
1972	83100
1973	85700
1974	87700
1975	89500
1976	89300
1977	90500
1978	93600
1979	95300
1980	97700
1981	95900
1982	109200
1983	111400
1984	111600
1985	115800
1986	122200
1987	122700
1988	132000
1989	145900
1990	152100
1991	150800
1992	157600
1993	168900
1994	174900
1995	191200
1996	218200
1997	220800
1998	250300
1999	276300
2000	289031
2001	284899
2002	242800
2003	189121
2004	144703
2005	134839
2006	125126
2007	139124
2008	158788
2009	168280
2010	224807
2011	244994
2012	257233.254295533
2013	266128
2014	263267
2015	250094
2016	229530
2017	216436
2018	219782
2019	225755
2020	81283.2
2021	96369.999