Year	Number
1971	123639
1978	102686
1979	113718
1980	115914
1981	125996
1982	129898
1983	138296
1984	140859
1985	144024
1986	150772
1987	156511
1988	156807
1989	155772
1990	150897
1991	147807
1992	145590
1993	122421
1994	120638
1995	123234
1996	122059
1998	111809
1999	113728
2000	119878
2001	128125
2002	117695
2003	118329
2004	123103
2005	125366
2006	124271
2007	125715
2008	126067
2009	127555
2010	131952
2011	138745
2012	142027
2013	134687
2014	131279
2015	132370
2016	122082
2017	114940