Year	Number of
1990	9453.21
1991	9586.07
1992	9772.79
1993	9912.47
1994	10046.19
1995	10222.98
1996	10457.01
1997	10657.76
1998	10951.7
1999	11232.13
2000	11457.46
2001	11612.76
2002	11789.19
2003	12125.36
2004	12351.64
2005	12545.54
2006	12772.19
2007	12971.29
2008	13177.07
2009	13435.87
2010	13705.35
2011	13985.33
2012	14281.66
2013	14740.52
2014	15140.12
2015	15767.26
2016	16579.06