Year	Number
1977	259782
1978	271360
1979	281820
1980	293879
1981	302040
1982	312314
1983	316596
1984	320164
1985	330456
1986	341719
1987	349996
1988	352828
1989	355956
1990	350847
1991	367419
1992	370008
1993	362634
1994	383449
1995	309339
1996	293496
1999	273943
2000	272542
2001	286006
2002	288110
2003	278960
2004	276638
2005	283806
2006	284642
2007	303771
2013	289006
2015	289066
2016	313474
2017	323488
2018	316135
2019	318114
2020	323148
2021	331652