Year	Number of
1990	26323.55
1991	27139.86
1992	28050.89
1993	28765.46
1994	29675.58
1995	30590.14
1996	31691.01
1997	32862.04
1998	33829.87
1999	34805.51
2000	35869.05
2001	36700.96
2002	37525.14
2003	38434.44
2004	39610.87
2005	40958.67
2006	42204.15
2007	43703.74
2008	45256.13
2009	46991.14
2010	48909.71
2011	50629.27
2012	52163.73
2013	54367.21
2014	56856.31
2015	59139.66
2016	60462.36