Year	Number of
1990	3111.32
1991	3219.62
1992	3328.95
1993	3442.48
1994	3569.58
1995	3710.57
1996	3781.16
1997	3857.43
1998	3942.44
1999	4027.01
2000	4115.2
2001	4216.44
2002	4311.54
2003	4413.9
2004	4529.96
2005	4652.19
2006	4706.33
2007	4761.3
2008	4822.61
2009	4894.33
2010	4971.13
2011	5026.94
2012	5084.98
2013	5110.6
2014	5145.34
2015	5190.35
2016	5236.36