Year	Number
1971	94659
1972	99444
1973	109028
1974	121579
1975	137832
1976	157745
1977	178153
1978	200916
1979	221822
1980	238763
1981	252367
1982	263950
1983	275440
1984	286092
1985	303404
1986	305046
1987	313629
1988	323942
1989	337553
1990	357754
1991	384086
1992	413402
1993	431015
1994	454536
1996	501383
1999	537624
2000	542001
2002	564134
2003	578265
2004	580229
2005	594733
2006	616912
2007	640307
2008	672157
2010	685883
2011	694344
2013	702734
2014	720877
2017	737097
2018	766641