Year	Number of
1990	4504.62
1991	4631.49
1992	4773.15
1993	4922.63
1994	5076.95
1995	5244.89
1996	5282.82
1997	5332.94
1998	5387.5
1999	5439.2
2000	5487.31
2001	5556.44
2002	5628.08
2003	5699.03
2004	5779.06
2005	5868.34
2006	5858.38
2007	5856.54
2008	5859.93
2009	5866.54
2010	5874.21
2011	5827.65
2012	5781.82
2013	5733.03
2014	5690.79
2015	5664.18
2016	5641.85