Year	Number of
1990	13725.52
1991	14571.33
1992	15404.2
1993	16108.98
1994	16835.42
1995	17581.05
1996	18258.56
1997	18869.98
1998	19472.65
1999	20054.61
2000	20675.41
2001	21281.64
2002	21866.7
2003	22503.75
2004	23421.15
2005	24441.74
2006	25378.98
2007	26345.46
2008	27242.83
2009	27992.33
2010	28896.51
2011	29686.48
2012	30987.62
2013	32090.97
2014	32846.69
2015	33911.1
2016	35024.51