Year	Number of
1990	27578.42
1991	28883.11
1992	30274.79
1993	31603.44
1994	32860.54
1995	34313.91
1996	35387.32
1997	36508.81
1998	37698.2
1999	38972.04
2000	40022.29
2001	41086.13
2002	42159.26
2003	43250.13
2004	44616.68
2005	46130.79
2006	47086.97
2007	48300.68
2008	49339.01
2009	49946.92
2010	50810.87
2011	51400.77
2012	51611.15
2013	51537.83
2014	50662.77
2015	50795.46
2016	51037.42