Year	Number of
1990	15243.14
1991	15084.66
1992	15703.94
1993	17832.33
1994	19016.93
1995	18005.89
1996	16579.78
1997	15451.77
1998	15090.3
1999	15806.96
2000	16044.45
2001	16005.4
2002	16172.52
2003	16528.96
2004	16483.03
2005	16758.18
2006	16031.83
2007	15898.36
2008	16158.18
2009	15757.29
2010	15909.12
2011	15741.07
2012	15474.67
2013	15421.96
2014	15468.87
2015	15470.83
2016	15791.73