Year	Percent
1983-01-01	30.573200000000000
1984-01-01	39.651100000000000
1985-01-01	38.187200000000000
1986-01-01	33.498200000000000
1987-01-01	30.701300000000000
1988-01-01	24.967100000000000
1989-01-01	17.837600000000000
1990-01-01	15.767000000000001
1991-01-01	16.015700000000000
1992-01-01	17.507000000000000
1993-01-01	17.540000000000000
1994-01-01	11.728600000000000
1995-01-01	9.939639999999999
1996-01-01	11.733200000000000
1997-01-01	14.099500000000000
1998-01-01	14.955900000000000
1999-01-01	19.354500000000000
2000-01-01	21.163400000000000
2001-01-01	25.261400000000000
2002-01-01	19.793200000000000
2003-01-01	18.498300000000000
2004-01-01	17.369600000000000
2005-01-01	17.343600000000000
2006-01-01	19.032600000000000
2007-01-01	21.499200000000000
2008-01-01	15.647600000000000
2009-01-01	22.451300000000000
2010-01-01	21.568800000000000
2011-01-01	18.966900000000000
2012-01-01	19.483600000000000
2013-01-01	16.564400000000000
2014-01-01	16.945800000000000
2015-01-01	18.201000000000000
2016-01-01	19.295500000000000