Year	Number of
1990	2151.56
1991	2282.23
1992	2418.44
1993	2564.12
1994	2724.65
1995	2906.67
1996	2950.83
1997	3008.67
1998	3079.82
1999	3151.3
2000	3222.99
2001	3290.75
2002	3359.29
2003	3446.09
2004	3534.64
2005	3628.61
2006	3736.76
2007	3849.14
2008	3988.52
2009	4136.26
2010	4292.85
2011	4542.87
2012	4813
2013	5114.17
2014	5429.72
2015	5760.73
2016	6111.39