Year	Number of
1990	1390.35
1991	1466.98
1992	1579.38
1993	1707.42
1994	1795.38
1995	1936.72
1996	2040.83
1997	2143.19
1998	2298.24
1999	2427.06
2000	2601.7
2001	2735.37
2002	2882.16
2003	3077.27
2004	3224.23
2005	3362.89
2006	3493.09
2007	3624.07
2008	3780.65
2009	3920.1
2010	4087.73
2011	4202.08
2012	4264.38
2013	4255.2
2014	4262.02
2015	4282.31
2016	4287.39