Year	Percent
1991-01-01	8.93972145207232
1992-01-01	8.59515939008388
1993-01-01	8.56093795673581
1994-01-01	8.45613952723614
1995-01-01	8.66653255595218
1996-01-01	8.94624830215023
1997-01-01	9.53809631582499
1998-01-01	9.56392526922598
1999-01-01	9.65881180788851
2000-01-01	10.47437154857830
2001-01-01	10.48054760008060
2002-01-01	10.48029661150890
2003-01-01	10.08971906457020
2004-01-01	10.15368692209360
2005-01-01	10.17811606310660
2006-01-01	9.70728461633836
2007-01-01	9.65408801683821
2008-01-01	10.37324612456010
2009-01-01	10.18913167688040
2010-01-01	8.85707050826166
2011-01-01	9.08196351818838
2012-01-01	9.67901757369825
2013-01-01	9.77540601212193
2014-01-01	9.55732538900348
2015-01-01	10.15091249661090
2016-01-01	10.33877803582880
2017-01-01	10.44091837572450