Year	Number of
1990	1621.7
1991	1736.37
1992	1871.15
1993	2027.25
1994	2197.15
1995	2376.2
1996	2460.11
1997	2542.03
1998	2619.54
1999	2696.25
2000	2773.44
2001	2802.12
2002	2829.65
2003	2866.4
2004	2908.63
2005	2958.41
2006	2980.92
2007	3009.62
2008	3045.85
2009	3082.39
2010	3117.08
2011	3177.56
2012	3237.3
2013	3287.45
2014	3341.42
2015	3402
2016	3463.39