Year	Number
1973	160983
1974	154556
1975	191863
1976	211309
1977	220566
1979	227246
1980	234867
1981	233723
1983	233983
1984	229250
1985	235265
1986	229023
1987	227730
1988	238782
1990	236573
1991	237000
1999	230735
2000	228307
2001	227205
2002	227934
2003	229325
2004	245533
2005	246332
2009	266933
2010	260371
2011	260325
2013	228935
2014	223920
2015	215200
2016	216813
2017	204080
2018	200563