Year	Number of
1990	3825.82
1991	3939.31
1992	4074.48
1993	4223.92
1994	4394.69
1995	4596.91
1996	4765.76
1997	4950.79
1998	5147.47
1999	5360.49
2000	5592.47
2001	5773.59
2002	5961.67
2003	6184.77
2004	6411.3
2005	6641.87
2006	6757.16
2007	6869.52
2008	7005.52
2009	7145.43
2010	7289.54
2011	7353.11
2012	7418.03
2013	7479.79
2014	7543.63
2015	7609.97
2016	7639.81