Year	Percent
1979-01-01	7.4943899999999990
1980-01-01	6.5903399999999990
1981-01-01	5.3812500000000000
1982-01-01	5.3932199999999995
1983-01-01	4.9398599999999995
1984-01-01	5.4350100000000000
1985-01-01	6.5756200000000000
1986-01-01	9.2537200000000000
1987-01-01	16.2985000000000000
1988-01-01	33.1946000000000000
1989-01-01	50.0227000000000000
1990-01-01	44.6190000000000000
1991-01-01	31.8229000000000000
1992-01-01	28.6318000000000000
1993-01-01	31.8024000000000000
1994-01-01	36.7516000000000000
1995-01-01	34.6576000000000000
1996-01-01	26.5366000000000000
1997-01-01	14.4845000000000000
1998-01-01	19.2303000000000000
1999-01-01	45.3401000000000000
2000-01-01	44.1612000000000000
2001-01-01	36.3432000000000000
2002-01-01	40.6244000000000000
2003-01-01	43.6937000000000000
2004-01-01	50.7653000000000000
2005-01-01	67.0027000000000000
2006-01-01	79.8076000000000000
2007-01-01	88.3203000000000000
2008-01-01	72.0324000000000000
2009-01-01	68.7869999999999900
2010-01-01	92.3336000000000000
2011-01-01	89.7224000000000000
2012-01-01	88.5246000000000000
2013-01-01	94.0605000000000000
2014-01-01	89.0002000000000000
2015-01-01	85.6138000000000000
2016-01-01	86.8104000000000000
2017-01-01	100.4480000000000000