Year	Number
1999	547298
2000	505651
2001	604111
2002	580528
2003	622258
2005	581262
2006	621822
2007	533563
2008	454405
2009	482195
2011	343048
2013	279049
2014	235160
2015	206679
2016	295185
2017	333405