Year	Percent
1976-01-01	1.5579300000000000
1977-01-01	1.5730100000000000
1978-01-01	1.5778600000000000
1979-01-01	1.7236300000000000
1980-01-01	1.7142400000000002
1981-01-01	1.7867800000000000
1982-01-01	1.7604200000000000
1983-01-01	2.1535400000000000
1984-01-01	1.9345800000000000
1985-01-01	1.7996700000000000
1986-01-01	1.5621200000000002
1987-01-01	1.5466700000000000
1988-01-01	1.5932000000000000
1989-01-01	1.7420700000000000
1990-01-01	2.0315800000000000
1991-01-01	2.2021599999999997
1992-01-01	2.2050300000000000
1993-01-01	25.6799000000000000
1994-01-01	46.1786000000000000
1995-01-01	47.7727000000000000
1996-01-01	48.7324000000000000
1997-01-01	50.2645000000000000
1998-01-01	46.1695000000000000
1999-01-01	42.4247000000000000
2000-01-01	46.1903000000000000
2001-01-01	49.1422000000000000
2002-01-01	52.6040000000000000
2003-01-01	54.9861000000000000
2004-01-01	57.9394000000000000
2005-01-01	61.7733000000000000
2006-01-01	65.5257000000000000
2007-01-01	67.1977000000000000
2008-01-01	67.7019000000000000
2009-01-01	69.7224000000000000
2010-01-01	72.1782000000000000
2011-01-01	71.9331000000000000
2012-01-01	74.1090000000000000
2013-01-01	79.1494000000000000
2014-01-01	86.2487000000000000
2015-01-01	90.2332000000000000
2016-01-01	93.3311000000000000