Year	Number
1980	172832
1981	154155
1982	142025
1983	136048
1984	174383
1985	177119
1986	286155
1987	314027
1988	280233
1989	298607
1990	338982
1991	326642
1992	369820
1993	475208
1994	484354
1995	544475
1996	545621
1997	577752
1998	572054
1999	613581
2000	777785
2001	771480
2002	878700
2003	1005258
2004	1197021
2005	1330793
2006	1452127
2007	1426198
2008	1448687
2009	1507261
2010	1860692
2011	2218766
2012	2450311
2013	2707088
2014	2988878