Year	Number of
1990	12973.42
1991	13173.68
1992	13354.77
1993	13559.21
1994	13660.11
1995	13808.05
1996	13885.17
1997	13951.54
1998	14046.44
1999	14122.36
2000	14138.15
2001	14316.58
2002	14587.67
2003	14849.39
2004	15032.51
2005	15319.35
2006	15509.37
2007	15739.52
2008	15965.14
2009	16094.08
2010	16344.85
2011	16500.28
2012	16806.26
2013	17039.36
2014	17225.34
2015	17312.55
2016	17347.54