Year	Number of
1990	5056.83
1991	5283.21
1992	5345.03
1993	5421.58
1994	5527.7
1995	5638.93
1996	5694.9
1997	5906.75
1998	5979.23
1999	6037.16
2000	6057.02
2001	6089.95
2002	6115.53
2003	6208.2
2004	6288.7
2005	6421.99
2006	6521.38
2007	6637.45
2008	6684.11
2009	6791.04
2010	6687.46
2011	6774.54
2012	6930.53
2013	6927.38
2014	6844.83
2015	6857.78
2016	6897.5