Year	Number of
1990	28424.73
1991	29966.82
1992	31614.64
1993	33344.07
1994	35156.72
1995	37049.49
1996	38409.92
1997	39871.46
1998	41408.51
1999	42928.17
2000	44527.11
2001	45898.82
2002	47292.13
2003	48688.64
2004	50083.95
2005	51473.61
2006	52796.1
2007	54169.45
2008	55552.34
2009	56919.5
2010	58302.39
2011	59351.86
2012	60357.93
2013	61364.44
2014	62336.84
2015	63420.41
2016	64530.16