Year	Number
1971	219193
1972	227892
1973	224607
1975	231470
1976	243589
1977	399128
1978	404720
1980	543949
1981	425224
1982	533105
1983	543589
1984	585579
1986	677164
1987	730300
1988	741715
1989	765022
1993	826906
1994	853752
1995	780682
1996	731012
1997	770688
1999	557310
2000	618116
2001	513548
2002	619303
2003	710376
2004	740942
2005	742330
2006	749510
2007	742331
2008	829377
2013	1501452
2014	1590879
2015	1754880
2016	1762522
2017	2300769