Year	Number of
1990	25990.8
1991	26539.93
1992	27116.99
1993	27727.89
1994	28431.37
1995	29254.29
1996	29765.04
1997	30285.65
1998	30837.91
1999	31496.53
2000	32225.62
2001	32732.53
2002	33192.03
2003	33601.76
2004	34119.19
2005	34692.65
2006	35176.25
2007	35602.42
2008	35977.05
2009	36395.06
2010	36858.49
2011	37634.51
2012	38414.97
2013	39180.31
2014	40054.92
2015	40957.42
2016	41885.83