Year	Number of
1990	9838.97
1991	10269.3
1992	10737.56
1993	11238.87
1994	11776.53
1995	12362.24
1996	12531.82
1997	12728.89
1998	12945.04
1999	13178.79
2000	13441.01
2001	13241.81
2002	13071.43
2003	12917.46
2004	12780.66
2005	12672.02
2006	12621.03
2007	12576.8
2008	12560.07
2009	12555.44
2010	12572.29
2011	12650.27
2012	12746.99
2013	12846.9
2014	12957.63
2015	13080.29
2016	13211.93