Year	Number
1970	72700
1971	88900
1972	100300
1973	105300
1974	110900
1975	120200
1976	140700
1977	143100
1978	142900
1979	150900
1980	142600
1981	119000
1982	103300
1983	118200
1984	127900
1985	127300
1986	133300
1987	133000
1988	130000
1989	133200
1990	129000
1991	93800
1992	116900
1993	143800
1994	151200
1995	158500
1996	167200
1997	183500
1998	188200
1999	205200
2000	220821
2001	237439
2002	235443
2003	268637
2004	314685
2005	347743
2006	363872
2007	397337
2008	415443
2009	405656
2010	459987.60546164855
2011	458432.212389811
2012	409115.8316511268
2013	407489
2014	414473.868
2015	420199
2016	436849
2017	484988
2018	549291
2019	566402
2020	235446.363
2021	275557