Year	Number
1971	145279
1972	137561
1973	151246
1974	41107
1975	48047
1976	46710
1977	55149
1978	61535
1979	66722
1980	69304
1981	67641
1982	61706
1983	55466
1984	51178
1985	53497
1986	54883
1987	54081
1988	53060
1989	50204
1990	50305
1991	49760
1992	51013
1993	52764
1999	33660
2000	41129
2001	46244
2002	53622
2003	56746
2004	68372
2005	77659
2006	114790
2007	117324
2008	123584
2009	132139
2010	122027
2011	120455
2012	126014
2013	141515
2014	133401
2015	122007
2016	107554
2017	128976