Year	Number of
1990	13399.96
1991	13815.69
1992	14235.62
1993	14703.4
1994	15071.97
1995	15410.57
1996	15601.98
1997	15794.73
1998	16106.54
1999	16336.65
2000	16384.22
2001	16596.91
2002	16809.89
2003	17117.27
2004	17254.77
2005	17482.31
2006	17549.59
2007	17734.88
2008	17773.2
2009	17796.63
2010	17746.03
2011	17680.62
2012	17676.57
2013	17329.31
2014	17033.58
2015	16883.68
2016	16788.29