Year	Number
1971	350225
1972	407805
1973	455449
1974	488882
1975	522473
1976	556169
1977	571723
1978	574770
1979	630423
1980	645186
1981	662843
1983	721710
1986	748733
1999	821775
2001	766087
2002	750204
2003	739028
2004	745428
2005	713902
2006	755338