Year	Number
1970	47600
1971	53500
1972	58100
1973	65100
1974	66400
1975	32800
1976	28200
1977	29200
1978	30800
1979	31400
1980	33500
1981	34100
1982	35100
1983	35300
1984	33900
1985	31000
1986	31700
1987	34600
1988	39500
1989	40300
1990	45000
1991	47000
1992	59900
1993	63300
1994	65900
1995	71600
1996	80500
1997	94700
1998	97600
1999	117200
2000	112462
2001	96049
2002	112324
2003	117404
2004	127025
2005	148604
2006	119668
2007	138093
2008	159135
2009	123551
2010	111961.407853906
2011	129004
2012	131870
2013	158096
2014	157702
2015	160003
2016	154448
2017	170444
2018	182753
2019	186711
2020	73742.363
2021	97777