Year	Number
1997	148000
1998	241000
1999	327000
2000	153000
2001	152000
2002	184000
2003	189000
2004	231000
2005	189000
2006	254000
2007	272000
2008	337000
2009	311000
2010	324000
2011	367000
2012	469000
2013	471000
2014	511000
2015	523000
2016	568000