Year	Number
1976	318376
1978	316157
1979	314237
1980	314088
1981	314415
1982	307510
1983	287000
1984	284843
1985	303040
1986	311248
1987	316147
1988	324829
1989	330751
1990	335252
1991	340100
1992	330802
1993	319481
1994	320880
1995	328816
1996	328441
1997	333523
1998	343949
1999	348369
2000	351163
2001	361549
2002	363710
2003	375804
2004	369474
2006	379731
2007	380293
2008	376901
2009	332929
2010	335865
2011	336461
2012	330089
2013	322077
2014	306610
2015	292278
2016	272891
2017	259397
2018	248267