Year	Number of
1990	34528.31
1991	34626.53
1992	34824.01
1993	35207.8
1994	35501.84
1995	35716.13
1996	35326.75
1997	34862.02
1998	35121.78
1999	35665.01
2000	35774.77
2001	35894.27
2002	36133.24
2003	36134.42
2004	35974.3
2005	35957.11
2006	35845.83
2007	36015.43
2008	36349.11
2009	36641.76
2010	37091.07
2011	37503.32
2012	38120.33
2013	38962.07
2014	39719.3
2015	41037.99
2016	42211.47