Year	Number of
1990	4452.86
1991	4527.36
1992	4595.71
1993	4767.2
1994	4909.93
1995	5085.62
1996	4896.23
1997	4987.53
1998	5056.33
1999	5129.34
2000	5190.74
2001	5230.17
2002	5257.83
2003	5285.38
2004	5308.41
2005	5338.86
2006	5351.37
2007	5390.49
2008	5444.02
2009	5520.37
2010	5605.92
2011	5691.22
2012	5794.1
2013	5914.49
2014	6048.27
2015	6186.39
2016	6328.83