Year	Number of
1990	1071.5
1991	1112.67
1992	1148.99
1993	1174.81
1994	1204.15
1995	1249.88
1996	1280.1
1997	1279.94
1998	1302.82
1999	1311.3
2000	1313.72
2001	1334.71
2002	1349.96
2003	1394.17
2004	1417.05
2005	1452.27
2006	1494.73
2007	1538.67
2008	1608.95
2009	1671.58
2010	1732.44
2011	1801.03
2012	1880.31
2013	1953.19
2014	2038.97
2015	2131.86
2016	2221.89