Year	Number of
1990	2142.42
1991	2251.18
1992	2364.94
1993	2485.59
1994	2613.76
1995	2751.67
1996	2885.43
1997	3030.98
1998	3187.68
1999	3349.36
2000	3515.55
2001	3653.18
2002	3786.18
2003	3921.41
2004	4066.61
2005	4226.95
2006	4381.33
2007	4550.34
2008	4738.44
2009	4938
2010	5151.05
2011	5364.76
2012	5598.96
2013	5850.07
2014	6127.93
2015	6434.58
2016	6764.71