Year	Number
1970	193379
1971	190679
1972	200247
1973	203619
1974	211501
1975	210100
1976	211833
1977	223427
1978	241358
1980	210906
1982	233297
1983	237774
1984	254009
1985	234528
1986	248640
1987	243336
1988	245965
1989	261247
1990	246551
1991	229897
1992	206624
1993	203327
1994	199595
1995	218156
1996	229571
1999	162880
2000	142300
2001	115072
2002	62479
2004	42126
2005	37327
2006	62236
2007	65442
2008	58228
2010	64830