Year	Number
1971	477931
1972	475829
1973	482483
1974	486902
1975	503608
1976	511590
1977	519012
1978	528696
1979	537474
1980	541374
1981	554078
1982	553684
1983	578694
1984	589577
1985	603098
1986	619105
1987	632432
1988	641622
1989	647200
1990	651728
1991	658569
1992	663215
1994	695707
1995	702575
1998	635646
1999	629836
2014	631675
2015	634117
2016	638414
2017	637889
2018	637136
2019	634431
2020	633822
2021	631791