Year	Number of
1990	46861.69
1991	48674.67
1992	50777.5
1993	53135.78
1994	55604.51
1995	58155.17
1996	60906.88
1997	63652.96
1998	66491.51
1999	69605.88
2000	73094.65
2001	76304.11
2002	79835.27
2003	83738.6
2004	87949.39
2005	92477.96
2006	96585.52
2007	101030.51
2008	106030.85
2009	111355.16
2010	117034.84
2011	121540.46
2012	126323.71
2013	131410.09
2014	136904.07
2015	142840.62
2016	148940.6