Year	Number of
1990	14829.77
1991	14970.94
1992	15032.93
1993	15280.11
1994	15395.53
1995	15516.57
1996	15333.16
1997	15099.16
1998	15198.01
1999	15241.14
2000	15282.56
2001	15456.15
2002	15478.21
2003	15399.61
2004	15392.58
2005	15244.02
2006	15027.97
2007	15181.85
2008	15665.02
2009	16108.91
2010	16529.6
2011	16835.72
2012	17250.08
2013	17655.1
2014	18063.75
2015	18705.54
2016	19239.68