Year	Number of
1990	16224.81
1991	16592.71
1992	16953.91
1993	17298.96
1994	17670.9
1995	18092.32
1996	18395.82
1997	18723.14
1998	19058.64
1999	19378.18
2000	19751.16
2001	19962.81
2002	20168.12
2003	20370.1
2004	20602.68
2005	20894.02
2006	20990.15
2007	21110.98
2008	21250.06
2009	21404.63
2010	21585.23
2011	22150.5
2012	22747.53
2013	23360.77
2014	23945.42
2015	24552.41
2016	25181.95