Year	Number of
1990	26512.12
1991	25836.62
1992	26284.63
1993	28720.08
1994	29553.93
1995	27162.38
1996	24502.28
1997	22461.5
1998	21495.85
1999	22105.4
2000	22029.18
2001	21683.17
2002	21578.71
2003	21471.5
2004	20968.12
2005	20892.11
2006	19797.97
2007	19503.69
2008	19607.98
2009	18776.5
2010	18715.65
2011	18171.57
2012	17595.15
2013	17385.49
2014	17526.5
2015	18095.98
2016	19011.76