Year	Number of
1990	2428.75
1991	2470.48
1992	2507.45
1993	2569.72
1994	2632.66
1995	2700.4
1996	2790.3
1997	2903.83
1998	3025.12
1999	3146.67
2000	3236.98
2001	3317.66
2002	3412.36
2003	3519.73
2004	3579.18
2005	3656.98
2006	3700.57
2007	3794.34
2008	3826.68
2009	3871.76
2010	3943.18
2011	3974.85
2012	4027.3
2013	4062.98
2014	4087.59
2015	4128.94
2016	4185.39