Year	Percent
1979-01-01	14.49418120833330
1980-01-01	13.92324175000000
1981-01-01	12.90884450000000
1982-01-01	14.50792847500000
1983-01-01	16.99350465000000
1984-01-01	15.87481333333330
1985-01-01	14.66065799166670
1986-01-01	14.77553802500000
1987-01-01	14.78899149166670
1988-01-01	13.42671083333330
1989-01-01	11.69416635833330
1990-01-01	12.76799060833330
1991-01-01	16.26693043333330
1992-01-01	17.61255814166670
1993-01-01	17.20275377500000
1994-01-01	16.25195762500000
1995-01-01	14.81883930000000
1996-01-01	14.79708367500000
1997-01-01	14.63941848333330
1998-01-01	13.52239638333330
1999-01-01	12.42565272500000
2000-01-01	11.21841365833330
2001-01-01	12.27810166666670
2002-01-01	11.71822762500000
2003-01-01	11.26651341666670
2004-01-01	10.85269999166670
2005-01-01	10.32914358333330
2006-01-01	9.46164228333333
2007-01-01	9.24072794166666
2008-01-01	8.58871284166666
2009-01-01	10.34173182500000
2010-01-01	11.11975277500000
2011-01-01	10.76287250000000
2012-01-01	10.93516502500000
2013-01-01	11.34635832500000
2014-01-01	12.45582910833330
2015-01-01	11.90736215833330
2016-01-01	11.40103022500000
2017-01-01	11.47945550000000