Year	Number of
1990	4037.18
1991	4119.45
1992	4207.86
1993	4302.38
1994	4401.12
1995	4515.44
1996	4618.45
1997	4734.65
1998	4848.18
1999	4962.66
2000	5066.24
2001	5143.22
2002	5207.95
2003	5259.38
2004	5291.19
2005	5312.37
2006	5319.01
2007	5316.18
2008	5328.49
2009	5346.11
2010	5373.48
2011	5380.09
2012	5389.93
2013	5396.27
2014	5411.3
2015	5430.93
2016	5454.51