Year	Number of
1990	1002.07
1991	1005.89
1992	1000.65
1993	997.6
1994	1025.58
1995	1055.73
1996	1102.18
1997	1132.18
1998	1117.62
1999	1130.37
2000	1148.97
2001	1144.18
2002	1148
2003	1146
2004	1168.31
2005	1216.75
2006	1240.87
2007	1257.89
2008	1260.9
2009	1246.01
2010	1237.41
2011	1208.37
2012	1203.06
2013	1206.19
2014	1206.59
2015	1219.8
2016	1233.34