Year	Number of
1990	4327.17
1991	4345.14
1992	4454.23
1993	4529.84
1994	4611.65
1995	4724.38
1996	4831.13
1997	4923.22
1998	4994.23
1999	5097.25
2000	5180.35
2001	5202.78
2002	5285.89
2003	5405.02
2004	5506.9
2005	5570.79
2006	5652.2
2007	5709.43
2008	5731.8
2009	5786.74
2010	5911.7
2011	5975.84
2012	6055.84
2013	6134.81
2014	6233.95
2015	6348.37
2016	6481.84