Year	Number
1970	51700
1971	66100
1972	74700
1973	90400
1974	98300
1975	122400
1976	93700
1977	100300
1978	106400
1979	111700
1980	94000
1981	107600
1982	130300
1983	96900
1984	127000
1985	140400
1986	140200
1987	114200
1988	115800
1989	121200
1990	120300
1991	120100
1992	121400
1993	132100
1994	141600
1995	148700
1996	152500
1997	158300
1998	157700
1999	112300
2000	115831
2001	112560
2002	104711
2003	108854
2004	122477
2005	132275
2006	145747
2007	154837
2008	159917
2009	157007
2010	91520.1893953931
2011	82709.5449902358
2012	53518.9979970389
2013	5856
2014	5856
2015	6011
2016	6744
2017	10545
2018	10545
2019	7117
2020	1792.164
2021	1290.356