Year	Number
1971	509691
1972	521167
1973	516954
1974	516979
1975	508205
1976	419808
1977	431090
1978	437675
1979	446041
1980	447643
1981	449322
1982	446341
1983	439471
1984	441950
1985	434507
1986	424076
1987	410807
1988	406835
1989	409414
1990	418209
1991	426864
1992	446207
1993	443831
1994	455300
1995	454707
1996	460878
1997	469933
1998	469495
1999	479882
2000	494095
2001	499882
2002	501689
2003	508063
2004	425966
2005	430596
2006	432565
2007	432607
2008	431233
2009	428332
2010	426710
2011	422872
2012	415505
2013	541021
2014	536925
2015	540067
2016	539816
2017	543436
2018	546469
2019	514823
2020	513900
2021	520297
2022	533496