Year	Number of
1990	4219.35
1991	4366.41
1992	4521.64
1993	4677.14
1994	4836.4
1995	5010.12
1996	5145.88
1997	5294.58
1998	5455.18
1999	5618.86
2000	5790.01
2001	5964.26
2002	6149.42
2003	6337.04
2004	6540.15
2005	6758.01
2006	6955.02
2007	7170.01
2008	7394.56
2009	7628.09
2010	7865.99
2011	8097.73
2012	8345.73
2013	8586.94
2014	8829.04
2015	9072.04
2016	9317.27