Year	Number
1980	8723
1981	7911
1982	7705
1983	5857
1984	5981
2000	49623
2001	40815
2002	42220
2003	38063
2004	61767
2005	71558
2006	82888
2007	87649
2008	81480
2009	67456
2010	77308
2011	79045
2012	79322
2013	86617
2014	113785
2015	130687
2016	125551