Year	Number of
1990	3529.08
1991	3692.56
1992	3853.98
1993	4008.95
1994	4174.75
1995	4363.36
1996	4575.37
1997	4849.78
1998	4990.67
1999	5085.3
2000	5171.31
2001	5103.89
2002	5065.3
2003	5073.99
2004	5066.26
2005	5042.89
2006	5195.53
2007	5317.02
2008	5462.14
2009	5610.77
2010	5783.91
2011	5912.77
2012	6060.85
2013	6219.5
2014	6377.35
2015	6573.83
2016	6772.87