Year	Number of
1990	1392.81
1991	1492.73
1992	1604.67
1993	1730.04
1994	1867.8
1995	2019.06
1996	2156.12
1997	2303.39
1998	2469.4
1999	2651.3
2000	2852.37
2001	3003.29
2002	3165.03
2003	3352.46
2004	3550.86
2005	3761.23
2006	3951.48
2007	4150.12
2008	4376.69
2009	4619.76
2010	4882.88
2011	5131.84
2012	5398.9
2013	5687.41
2014	6001.25
2015	6341.05
2016	6710.31