Year	Number
1971	684762
1972	719326
1973	747570
1974	752712
1975	758981
1976	601077
1977	569046
1978	544234
1979	226634
1980	164237
1981	221116
1983	351252
1985	393235
1986	344848
1987	303854
1988	263584
1989	296506
1993	643301
1996	912446
1999	583602
2000	704809
2003	641206
2004	697136
2007	535980