Year	Percent
1991-01-01	10.2616972651484
1992-01-01	10.0212395392607
1993-01-01	10.2370265860744
1994-01-01	10.1999612848681
1995-01-01	10.1692764904735
1996-01-01	10.5598518576140
1997-01-01	10.8243676595769
1998-01-01	10.9261674561421
1999-01-01	11.0927462485914
2000-01-01	11.3064869036414
2001-01-01	11.5716546859534
2002-01-01	11.3595845275298
2003-01-01	11.0952847214695
2004-01-01	11.3203194490704
2005-01-01	11.0579063820989
2006-01-01	11.1843803244197
2007-01-01	11.1697653835844
2008-01-01	11.3016339311906
2009-01-01	10.6880104006427
2010-01-01	11.2460322964624
2011-01-01	11.6205670041578
2012-01-01	11.1870620656495
2013-01-01	10.9293206056105
2014-01-01	10.6523364956686
2015-01-01	10.9051067150729
2016-01-01	10.8818317928182
2017-01-01	10.8688345361450