Year	Number
1981	1761000
1986	1910800
1989	1943800
1990	1943400
1991	1918700
1992	1897000
1993	1861000
1994	1830600
1996	1670200
1997	1743623
1998	1796238
1999	1871608
2000	1913017
2001	1945586
2002	1932494
2003	1976390
2004	1992107
2005	1938112
2006	1878006
2007	1768115
2008	1671337
2009	1632531
2010	1598333
2011	1566584
2012	1533403
2013	1494586
2014	1475996
2015	1489036
2016	1525811
2017	1574083
2018	1643803
2019	1724786