Year	Number
1970	187100
1971	186500
1972	178200
1973	180600
1974	174400
1975	200500
1976	210200
1977	188500
1978	198400
1979	206900
1980	209300
1981	207700
1982	200600
1983	198200
1984	198600
1985	192800
1986	176500
1987	178500
1988	183300
1989	180200
1990	178500
1991	174100
1992	163700
1993	149400
1994	143800
1995	137800
1996	154100
1997	159000
1998	152500
1999	145800
2000	143612
2001	137114
2010	266822.2892449704
2011	307977.71707607375
2012	311610.2905595143
2013	329263.772
2014	346254.1529131582
2015	345543
2016	341547
2017	383488
2018	410069
2019	417461.09
2020	215962.91340000002
2021	325159.145