Year	Number
1971	85859
1972	50991
1973	62793
1974	83095
1975	111517
1976	209083
1977	270940
1978	172758
1979	176800
1980	301739
1981	309153
1982	331674
1983	342520
1984	367136
1985	351274
1986	348958
1987	352927
1988	367792
1989	357321
1990	344505
1991	330172
1992	314168
1993	299422
1994	266660
1995	228974
1996	244253
1997	212558
1999	183515
2000	202286
2001	226761
2002	257400
2003	271891
2004	260389
2005	268612
2006	270962
2007	253190
2008	228425
2009	216621
2010	203146
2011	214859
2012	210271
2013	216953
2014	199318
2015	194540
2016	202192
2017	203825
2018	207590