Year	Number
1970	168900
1971	173200
1972	167600
1973	178100
1974	170500
1975	189900
1976	211000
1977	187300
1978	193800
1979	210100
1980	225400
1981	235300
1982	232000
1983	241100
1984	233200
1985	233000
1986	228600
1987	222000
1988	223800
1989	209300
1990	208400
1991	198400
1992	192600
1993	183800
1994	193400
1995	185000
1996	195600
1997	184700
1998	182300
1999	159200
2000	167795
2001	161861
2002	153359
2003	156369
2004	176521
2005	183126
2006	184038
2007	213090
2008	181228
2009	198073
2010	331174.8344430372
2011	379240.9494917603
2012	376331.9298692406
2013	430081.8152386171
2014	437496.1510407926
2015	412495
2016	426687
2017	520216
2018	581319.9644896858
2019	533290.3
2020	299967.93539999996
2021	349000.37000000005