Year	Number
1971	184533
1972	183049
1973	182792
1977	218587
1978	219463
1981	195708
1982	184073
1983	172837
1986	157811
1987	202591
1988	217017
1989	224495
1990	196897
1991	229859
2005	406754
2006	415131
2007	370697
2008	315636
2009	320081
2010	312010
2011	340111
2012	329596
2017	140699