Year	Number of
1990	2177.01
1991	2338.21
1992	2486.08
1993	2635.52
1994	2784.29
1995	2921.18
1996	3031.89
1997	3067.17
1998	3118.72
1999	3156.56
2000	3181.43
2001	3221.35
2002	3253.27
2003	3280.31
2004	3306.84
2005	3320.03
2006	3324.91
2007	3331.88
2008	3370.45
2009	3417.72
2010	3468.31
2011	3486.87
2012	3563.36
2013	3700.92
2014	3860.36
2015	4030.41
2016	4199.14