Year	Number
1971	388812
1972	403252
1973	361784
1974	347828
1975	319680
1976	300519
1977	294586
1983	356121
1984	376227
1985	374519
1986	374335
1987	371112
1988	372383
1991	334480
1993	546995
1994	556824
1995	566230
1996	569041
1999	556868
2000	580842
2001	643304
2002	681721
2003	706131
2004	664213
2005	715237
2006	731974
2007	738416
2008	745659
2009	733992
2010	718407
2011	705921
2012	706682
2013	554005
2014	553401
2015	549733
2016	545335
2017	524924