Year	Number of
1990	1034.84
1991	1050.87
1992	1069.71
1993	1090.65
1994	1112.98
1995	1137.75
1996	1172.17
1997	1208.73
1998	1247.52
1999	1289.03
2000	1334.9
2001	1451.37
2002	1581.83
2003	1727.71
2004	1890.74
2005	2074.91
2006	2240.3
2007	2424.45
2008	2631.53
2009	2859.66
2010	3111.08
2011	3138.07
2012	3164.51
2013	3189.18
2014	3221.64
2015	3264.44
2016	3297.09