Year	Percent
1980-01-01	33.157200000000000
1981-01-01	28.525300000000000
1982-01-01	26.881700000000000
1983-01-01	26.008500000000000
1984-01-01	31.098500000000000
1985-01-01	32.795000000000000
1986-01-01	35.910900000000000
1987-01-01	30.249100000000000
1988-01-01	31.485600000000000
1989-01-01	29.688700000000000
1990-01-01	29.465000000000000
1991-01-01	39.267300000000000
1992-01-01	44.173400000000000
1993-01-01	42.711200000000000
1994-01-01	39.343600000000000
1995-01-01	34.993600000000000
1996-01-01	35.259300000000000
1997-01-01	34.433800000000000
1998-01-01	28.473500000000000
1999-01-01	25.499000000000002
2000-01-01	23.885600000000000
2001-01-01	25.732200000000000
2002-01-01	30.800700000000000
2003-01-01	31.362000000000000
2004-01-01	31.325400000000000
2005-01-01	31.292700000000000
2006-01-01	26.938100000000000
2007-01-01	24.370800000000000
2008-01-01	29.819500000000000
2009-01-01	34.198800000000000
2010-01-01	32.505200000000000
2011-01-01	36.199900000000000
2012-01-01	37.581800000000000
2013-01-01	40.701300000000000
2014-01-01	44.539300000000000
2015-01-01	50.004000000000000
2016-01-01	70.684200000000000