Year	Number of
1990	36842.44
1991	37952.37
1992	39356.48
1993	40791.98
1994	42236.39
1995	43638.27
1996	44869.88
1997	46074.1
1998	47395.27
1999	49276.01
2000	51453.93
2001	53921.14
2002	55898.93
2003	56483.82
2004	56952.22
2005	57960.76
2006	58826.05
2007	59875.28
2008	60878.25
2009	61793.72
2010	62669.27
2011	63585.3
2012	64720.46
2013	65708.55
2014	67373.58
2015	67934.09
2016	67849.72