Year	Number of
1990	3055.93
1991	3223.99
1992	3401.34
1993	3590.61
1994	3800.41
1995	4052.98
1996	4395.35
1997	4799.7
1998	5273.42
1999	5817.68
2000	6441.05
2001	6928.14
2002	7457.53
2003	8031.63
2004	8644.14
2005	9298.53
2006	9757.79
2007	10221.99
2008	10708.52
2009	11220.68
2010	11766.98
2011	12138.95
2012	12529.05
2013	12933.76
2014	13342.31
2015	13749.25
2016	14144.6