Year	Number
1970	55800
1971	58600
1972	54900
1973	58600
1974	63500
1975	69000
1976	77400
1977	85400
1978	102200
1979	113300
1980	117100
1981	154100
1982	158300
1983	216900
1984	227700
1985	248500
1986	248400
1987	220100
1988	219700
1989	233800
1990	238900
1991	228900
1992	228900
1993	230800
1994	231800
1995	266900
1996	252900
1997	244500
1998	240900
1999	132200
2000	127541
2001	95188
2002	46967
2003	52268
2010	341640.429165812
2011	438178.470407323
2012	703966.421078759
2013	652452
2014	553944
2015	657927
2016	577780
2017	333899
2018	508978.939934003
2019	541787.136860717
2020	79620
2021	157784