Year	Number of
1990	29058.84
1991	28295.11
1992	30018.61
1993	34383.92
1994	35929.08
1995	33081.24
1996	29627.23
1997	26689.01
1998	25518.11
1999	26830.72
2000	27522.81
2001	26934.68
2002	26842.25
2003	26367.55
2004	25437.34
2005	25185.18
2006	23238.35
2007	22479.65
2008	22288.1
2009	20995.67
2010	20793.86
2011	20026.26
2012	19159.97
2013	19016.03
2014	19132.02
2015	19638.43
2016	19972.27