Year	Percent
1981-01-01	20.806500000000000
1982-01-01	8.398890000000000
1983-01-01	16.444900000000000
1984-01-01	10.165400000000000
1985-01-01	11.291100000000000
1986-01-01	6.138330000000001
1987-01-01	22.825800000000000
1988-01-01	12.380400000000000
1989-01-01	21.423200000000000
1990-01-01	24.564600000000000
1991-01-01	20.573700000000000
1992-01-01	24.711100000000000
1993-01-01	9.432610000000000
1994-01-01	6.038209999999999
1995-01-01	29.561700000000000
1996-01-01	9.868400000000000
1997-01-01	23.085400000000000
1998-01-01	32.457600000000000
1999-01-01	35.318100000000000
2000-01-01	41.595000000000000
2001-01-01	18.139600000000000
2002-01-01	20.967500000000000
2003-01-01	31.826100000000000
2004-01-01	31.626400000000000
2005-01-01	24.592100000000000
2006-01-01	32.655400000000000
2007-01-01	53.790300000000000
2008-01-01	30.636900000000000
2009-01-01	34.662400000000000
2010-01-01	31.743700000000000
2011-01-01	31.384100000000000
2012-01-01	28.805400000000000
2013-01-01	29.723000000000003
2014-01-01	30.276100000000000
2015-01-01	29.166200000000000
2016-01-01	27.447700000000000
2017-01-01	34.094000000000000