Year	Number
1970	83047
1971	84751
1972	87236
1973	91927
1974	96962
1975	101216
1976	105505
1977	110461
1978	110395
1979	113668
1983	126474
1984	140120
1985	151168
1986	158468
1987	176226
1988	186101
1994	156668
1998	177930
2000	214873
2001	147513
2002	151319
2003	161857
2004	172394
2005	173536
2006	188586
2007	196172
2008	221331