Year	Number of
1990	15336.75
1991	15994.6
1992	15842.29
1993	15547.4
1994	15710.59
1995	16306.61
1996	16113.02
1997	16499.62
1998	16734.46
1999	17614.56
2000	17330.3
2001	17306.17
2002	17351.84
2003	17405.16
2004	17728.23
2005	17822.7
2006	17971.75
2007	18156
2008	18108.48
2009	18015.28
2010	17894.4
2011	17799.8
2012	18022.05
2013	17859.17
2014	17261.52
2015	17090.33
2016	16983.55