Year	Number of
1990	2196.56
1991	2250.95
1992	2306.41
1993	2367.27
1994	2432.46
1995	2503.72
1996	2607.14
1997	2715.43
1998	2836.87
1999	2964.7
2000	3102.61
2001	3228.61
2002	3363.79
2003	3516.04
2004	3673.3
2005	3836.73
2006	3989.61
2007	4148.67
2008	4320.48
2009	4502.36
2010	4695.87
2011	4911.31
2012	5134.81
2013	5365.11
2014	5606.07
2015	5859.45
2016	6123.15