Year	Number
1971	556064
1972	591539
1973	630229
1974	680710
1975	675357
1976	610815
1977	571261
1978	522031
1979	483908
1999	501881
2000	419413
2001	329935
2002	230270
2003	274899
2004	266380
2005	306493
2006	282401
2007	247566
2008	311000
2009	245099
2010	218114
2011	218626
2012	218437
2013	244940
2014	255486
2015	279414
2016	387517