Year	Number
1980	54892
1981	34758
1982	31232
1983	35129
1984	26355
1986	54703
1987	40003
1988	47120
1989	63686
1990	64974
1991	66177
1992	82904
1993	90871
1994	95466
1995	107432
1996	115775
1998	118919
1999	125236
2000	164171
2001	130305
2002	125613
2003	128349
2004	122331
2005	143716
2006	151386
2007	164287
2008	157559
2009	126453
2010	159772
2011	148701
2012	159027
2013	164782
2014	162083
2015	158019
2016	156830
2017	158512