Year	Number of
1990	5332.24
1991	5454.56
1992	5578.52
1993	5630.59
1994	5682.25
1995	5741.08
1996	5625.98
1997	5525.95
1998	5411.17
1999	5276.1
2000	5136.75
2001	5103.18
2002	5064.42
2003	5024.98
2004	4970.24
2005	4934.43
2006	4986.65
2007	5052.89
2008	5112.55
2009	5178.01
2010	5259.58
2011	5383.92
2012	5519.07
2013	5654.88
2014	5797.91
2015	6002.04
2016	6230.09