Year	Number of
1990	14618.16
1991	15143.81
1992	15667.03
1993	16183.97
1994	16592.97
1995	16952.4
1996	17105.85
1997	17259.87
1998	17514.61
1999	17807.36
2000	17984.76
2001	18291.6
2002	18607.14
2003	19026.41
2004	19328
2005	19713.82
2006	19977.96
2007	20370.81
2008	20638.8
2009	20834.19
2010	20940.85
2011	20981.57
2012	21046.51
2013	20780.91
2014	20555.14
2015	20500.79
2016	20542.68