Year	Number of
1990	24789.46
1991	25136.52
1992	25664.75
1993	25919.32
1994	26328.27
1995	26731.45
1996	27315.85
1997	28017.32
1998	28502.92
1999	28857.05
2000	29269.78
2001	29581.65
2002	29956.13
2003	30164.94
2004	30760.05
2005	31593.68
2006	31532.88
2007	31801.97
2008	32309.04
2009	32635.61
2010	33237.01
2011	33779.24
2012	34060.85
2013	34894.21
2014	35785.77
2015	36534.75
2016	36628.83