Year	Number
1970	49079
1971	52453
1972	58537
1973	62090
1974	64450
1975	68693
1976	71262
1977	74292
1978	73965
1979	68860
1980	74012
1981	148378
1982	227294
1983	316104
1984	416136
1985	481708
1986	537092
1987	604188
1988	640668
1989	670266
1990	661066
1991	710619
1992	657344
1993	639559
1994	660986
1995	711094
1996	751349
1997	806126
1999	834880
2000	844183
2001	866171
2002	828456
2003	758229
2012	936734
2013	957461