Year	Number of
1990	50766.43
1991	50873.54
1992	55245.71
1993	64424.84
1994	68312.18
1995	63523.28
1996	56523.24
1997	51101.51
1998	48760.52
1999	51050.71
2000	52379.23
2001	51646.11
2002	51832.33
2003	51117.11
2004	49954.94
2005	50096.78
2006	46695.04
2007	45595.63
2008	45885.93
2009	43793.89
2010	43774.34
2011	42558.26
2012	41006.2
2013	40893
2014	41256.39
2015	41973.13
2016	42402.73