Year	Number
1992	45946
1993	49370
1994	35789
1995	31477
1996	30468
1997	28422
1998	29984
1999	33422
2000	37215
2001	40956
2002	34410
2003	35790
2004	36232
2005	36241
2006	40450
2007	41549
2008	41639
2009	39821
2010	44612
2011	43206
2012	44365
2013	46215
2014	40179
2015	45891
2016	43532
2017	41103