Year	Number of
1990	2639.82
1991	2901.47
1992	3179.46
1993	3483.6
1994	3822.14
1995	4204.92
1996	4586
1997	5021.64
1998	5519.19
1999	6062.4
2000	6649.37
2001	7251.88
2002	7898
2003	8621.74
2004	9413.95
2005	10283.07
2006	10935.93
2007	11639.46
2008	12437.58
2009	13313.46
2010	14264.5
2011	14964.86
2012	15703.73
2013	16517.64
2014	17352.44
2015	18208.18
2016	19108.84