Year	Number of
1990	6960.49
1991	7166.43
1992	7365.05
1993	7562.53
1994	7761.58
1995	7969.46
1996	8216.33
1997	8480.59
1998	8757.53
1999	9034.9
2000	9330.45
2001	9585.57
2002	9859.68
2003	10147.37
2004	10441
2005	10751.47
2006	10897.42
2007	11047.82
2008	11203.35
2009	11361.84
2010	11528.66
2011	11893.92
2012	12245.17
2013	12596.07
2014	12946.67
2015	13297.02
2016	13649.23