Year	Number
1970	134264
1971	137256
1972	141197
1973	148483
1974	155480
1975	161859
1976	169704
1977	173714
1978	173041
1979	178681
1983	193551
1984	213961
1985	230093
1986	238211
1987	265054
1988	278196
1994	238791
1998	257798
2000	311323
2001	223367
2002	229159
2003	241612
2004	254065
2005	256884
2006	272904
2007	285764
2008	323957