Year	Number of
1990	1742.49
1991	1895.77
1992	2069.06
1993	2257.57
1994	2469.83
1995	2709.57
1996	2971.34
1997	3266.17
1998	3599.07
1999	3970.61
2000	4381.26
2001	4709.3
2002	5058.78
2003	5432.42
2004	5838.19
2005	6277.67
2006	6589.07
2007	6909.51
2008	7235.17
2009	7579.49
2010	7938.37
2011	8230.8
2012	8524.34
2013	8816.66
2014	9115.74
2015	9438.02
2016	9775.59