Year	Number of
1990	5891.75
1991	6019.59
1992	6217
1993	6441.47
1994	6651.83
1995	6896.26
1996	7115.17
1997	7269.45
1998	7309.3
1999	7364.22
2000	7353.98
2001	7349.25
2002	7459.14
2003	7524.21
2004	7573.86
2005	7601.45
2006	7631.47
2007	7682.31
2008	7769.17
2009	7855.79
2010	7984.09
2011	8001.11
2012	8143.34
2013	8394.15
2014	8789.49
2015	9221.07
2016	9677.04