Year	Number
1981	941742
1986	853074
1989	848765
1990	822142
1991	816869
1992	831338
1993	843440
1994	838546
1995	851059
1996	786025
1997	802338
1998	862986
1999	905538
2000	922697
2001	997187
2002	1018556
2003	1073634
2004	1082859
2005	1066920
2006	1050711
2007	1027034
2008	995320
2009	941273
2010	886337
2011	844759
2012	802580
2013	777179
2014	762004
2015	760526
2016	762999
2017	775092
2018	792449