Year	Number of
1990	5133.04
1991	5366.6
1992	5601.35
1993	5831.48
1994	6072.59
1995	6336.32
1996	6492.06
1997	6655.05
1998	6825.31
1999	6998.62
2000	7180
2001	7271.7
2002	7375.85
2003	7493.11
2004	7623.2
2005	7765.97
2006	7876.29
2007	7989.95
2008	8108.12
2009	8229.73
2010	8355.03
2011	8431.64
2012	8528.04
2013	8638.71
2014	8752.01
2015	8868
2016	8991.88