Year	Number
1973	374026
1979	382804
1981	429730
1982	448362
1983	329884
1985	322285
1986	335666
1987	452887
1989	499016
1991	500989
1992	527496
1993	546260
1994	542600
1995	526097
1998	728829
1999	697116
2000	661715
2001	613626
2002	747114
2004	552181
2005	471621
2006	413376
2007	317058
2008	258182
2009	250752
2010	223474
2011	290683
2012	293256
2013	272041
2014	264943
2015	226745