Year	Number of
1990	1109.53
1991	1123.81
1992	1139.7
1993	1160.11
1994	1180.37
1995	1199.88
1996	1201.18
1997	1202.35
1998	1198.17
1999	1196.43
2000	1198.17
2001	1213.85
2002	1232.57
2003	1252.19
2004	1274.24
2005	1298.72
2006	1327.42
2007	1355.94
2008	1393.36
2009	1429.77
2010	1466.58
2011	1524.81
2012	1586.83
2013	1648.31
2014	1714.47
2015	1785.46
2016	1865.23