Year	Number of
1990	2774.7
1991	2848.19
1992	2924.48
1993	3006.86
1994	3093.59
1995	3176.49
1996	3262.86
1997	3349.57
1998	3443.64
1999	3518.96
2000	3594.44
2001	3646.64
2002	3701.08
2003	3757.07
2004	3801.57
2005	3844.6
2006	3866.46
2007	3889.51
2008	3925.46
2009	3971.72
2010	4024.23
2011	4065.17
2012	4101.54
2013	4130.93
2014	4170.9
2015	4216.86
2016	4271.35