1995,9.429123,
1996,7.807322,
1997,8.411014,
1998,10.91159,
1999,10.28255,
2000,9.924536,
2001,9.268356,
2002,10.13238,
2003,8.712384,
2004,9.283443,
2005,10.44523,
2006,10.07436,
2007,10.07342,
2008,9.142568,
2009,8.862356,
2010,10.52638,
2011,9.697671,
2012,11.29732,
2013,9.814575,
2014,7.963151,
2015,9.245616,
2016,11.24451,
2017,10.41025,