Year	Number of
1990	29355.68
1991	29682.89
1992	30165.78
1993	30415.18
1994	30830.7
1995	31219.41
1996	31790.04
1997	32442.73
1998	32876.96
1999	33097.12
2000	33357.64
2001	33391.09
2002	33489.83
2003	33616.1
2004	33893.5
2005	34470.32
2006	34182.35
2007	34182.35
2008	34319.74
2009	34494.21
2010	34882.88
2011	35214.32
2012	35328.08
2013	36088.99
2014	37005.64
2015	37688.88
2016	37804.07