Year	Number
1970	143100
1971	153800
1972	166100
1973	151900
1974	180300
1975	176800
1976	179300
1977	181200
1978	183500
1979	183200
1980	187300
1981	186600
1982	188500
1983	195400
1984	201900
1985	214700
1986	234100
1987	269100
1988	294300
1989	310800
1990	344200
1991	406600
1992	458000
1993	459200
1994	521000
1995	526600
1996	566600
1997	645900
1998	673300
1999	709800
2000	738297
2001	762178
2002	796129
2003	844881
2004	937143
2005	1023858
2006	1084821
2007	1126699
2008	1154472
2009	1080553
2010	971803.431596833
2011	1021899.93850367
2012	985668.769188173
2013	954874
2014	946082
2015	967453
2016	962803
2017	955827
2018	922648.643490196
2019	896647.181
2020	312142
2021	368400