Year	Number of
1990	13889.61
1991	14730.94
1992	15632.51
1993	16616.52
1994	17683.95
1995	18847.83
1996	19971.51
1997	21173.64
1998	22487.11
1999	23897.95
2000	25458.55
2001	26567.29
2002	27754.03
2003	29046.27
2004	30385.22
2005	31773.54
2006	33005.14
2007	34273.55
2008	35612.78
2009	36997.68
2010	38434.02
2011	39786.53
2012	41153.13
2013	42538.99
2014	43980.63
2015	45475
2016	46939.05