Year	Percent
1980-01-01	9.486180000000001
1981-01-01	12.911300000000000
1982-01-01	26.330500000000000
1983-01-01	22.056300000000000
1984-01-01	19.546800000000000
1985-01-01	21.146600000000000
1986-01-01	34.164700000000000
1987-01-01	35.272200000000000
1988-01-01	19.277400000000000
1989-01-01	15.793600000000000
1990-01-01	12.267500000000000
1991-01-01	11.499600000000000
1992-01-01	7.336450000000000
1993-01-01	5.082890000000000
1994-01-01	8.057020000000000
1995-01-01	9.460850000000000
1996-01-01	6.558590000000000
1997-01-01	15.327400000000000
1998-01-01	13.961500000000000
1999-01-01	14.514100000000000
2000-01-01	14.819400000000000
2001-01-01	13.550500000000000
2002-01-01	12.986600000000000
2003-01-01	13.025700000000000
2004-01-01	12.289400000000000
2005-01-01	11.490500000000000
2006-01-01	12.444800000000000
2007-01-01	13.548100000000000
2008-01-01	14.055900000000000
2009-01-01	17.428200000000000
2010-01-01	16.209000000000000
2011-01-01	16.423700000000000
2012-01-01	16.745400000000000
2013-01-01	18.050600000000000
2014-01-01	18.238700000000000
2015-01-01	17.619100000000000
2016-01-01	16.745200000000000