Year	Number
1978	270402
1979	267886
1980	272106
1981	273738
1982	273974
1983	273145
1984	279187
1985	285624
1986	253018
1988	270064
1990	308093
1992	336996
1996	342328
1997	318815
1998	309595
1999	323154
2000	312178
2003	280257
2004	324553
2005	324201
2006	312034
2007	298676
2008	304022
2009	312431
2010	315882
2011	322610
2012	305708
2013	328752
2014	333839
2015	349750
2016	386809