Year	Number of
1990	12250.86
1991	12692.23
1992	13200.27
1993	13686.89
1994	14142.42
1995	14671.49
1996	15163.96
1997	15652.01
1998	16159.26
1999	16650.78
2000	16902.38
2001	17277.59
2002	17667.79
2003	18146.84
2004	18581.15
2005	19110.96
2006	19466.11
2007	19827.59
2008	20190.25
2009	20434.05
2010	20824.59
2011	21079.93
2012	21847.62
2013	22202.6
2014	22097.83
2015	22356.9
2016	22629.87