Year	Number of
1990	36725.74
1991	37744.3
1992	38923.35
1993	40149.4
1994	41066.83
1995	42077.62
1996	42887.52
1997	43980.53
1998	45089.14
1999	46430.36
2000	47991.41
2001	49868.67
2002	51430.66
2003	51560.59
2004	51975.12
2005	53183.18
2006	54009.77
2007	55056.66
2008	56247.68
2009	57184.7
2010	57987.49
2011	58606.22
2012	59567.79
2013	60339.2
2014	62059.04
2015	62413.39
2016	62862.57