Year	Number of
1990	3431.69
1991	3539.12
1992	3660.9
1993	3790.68
1994	3924.53
1995	4065.22
1996	4365.53
1997	4700.89
1998	5073.74
1999	5495.93
2000	6001.48
2001	6248.9
2002	6513.95
2003	6803.03
2004	7116.98
2005	7463.8
2006	7607.98
2007	7820.49
2008	8071.39
2009	8359.79
2010	8692.36
2011	8932.77
2012	9210.53
2013	9520.42
2014	9860.43
2015	10232.67
2016	10599.86