Year	Number of
1990	2009.66
1991	2057.79
1992	2122.58
1993	2216.18
1994	2318.4
1995	2424.99
1996	2457.54
1997	2769.53
1998	3045.74
1999	3373.9
2000	3735.91
2001	3713.51
2002	3746.33
2003	3777.34
2004	3816.96
2005	3858.37
2006	3859.92
2007	3862.88
2008	3876.27
2009	3896.87
2010	3926.07
2011	3944.37
2012	3974.04
2013	4012.82
2014	4048.12
2015	4089.98
2016	4138.87