Year	Number of
1990	2249.65
1991	2406.52
1992	2585.23
1993	2761.79
1994	2972.2
1995	3211.57
1996	3466.95
1997	3772.56
1998	4141.25
1999	4357.79
2000	4635.19
2001	4883.05
2002	5071.32
2003	5291.11
2004	5575.33
2005	5853.15
2006	5988.82
2007	6189.97
2008	6343.85
2009	6487.58
2010	6685.98
2011	6878.79
2012	7031.78
2013	7195.65
2014	7384.33
2015	7549.87
2016	7698.73