Year	Number of
1990	17617.23
1991	18516.13
1992	19496.8
1993	20526.27
1994	21593.96
1995	22740.4
1996	21935.82
1997	21198.74
1998	20511.39
1999	19867.56
2000	19261.56
2001	19230.9
2002	19193.8
2003	19145.7
2004	19115.58
2005	19091.19
2006	18720.59
2007	18370.84
2008	18045.13
2009	17764.6
2010	17512.74
2011	17419.87
2012	17342.17
2013	17272.87
2014	17355.61
2015	17469.27
2016	17614.78