Year	Number
1970	40800
1971	40700
1972	41000
1973	40400
1974	37300
1975	36100
1976	39900
1977	42800
1978	46000
1979	48000
1980	47800
1981	43000
1982	40400
1983	39100
1984	40400
1985	43200
1986	45300
1987	45900
1988	51200
1989	59700
1990	66500
1991	70000
1992	77100
1993	109100
1994	118700
1995	141200
1996	164700
1997	182700
1998	213000
1999	233300
2000	225906
2001	178331
2002	133682
2003	132779
2004	154218
2005	151939
2006	158016
2007	173818
2008	179019
2009	249997
2010	127677.532209862
2011	131577
2012	132099.342541943
2013	130230
2014	132976.52964928
2015	141116
2016	147324
2017	145540
2018	140674
2019	137206.817
2020	57072.125
2021	73673.104