Year	Number of
1990	13172.04
1991	13280.3
1992	13403.1
1993	13618.51
1994	13791.94
1995	13760.11
1996	13872.43
1997	13849.57
1998	13894.15
1999	13976.69
2000	14132.1
2001	14194.6
2002	14309.38
2003	14338.1
2004	14327
2005	14408.13
2006	14463.02
2007	14515.08
2008	14611.38
2009	14712.49
2010	14812.93
2011	14963.12
2012	15134.94
2013	15299.09
2014	15328.77
2015	15717.15
2016	16120.88