Year	Percent
1980-01-01	2.057660000000000
1981-01-01	1.332040000000000
1982-01-01	1.056200000000000
1983-01-01	1.690090000000000
1984-01-01	2.040500000000000
1985-01-01	2.758540000000000
1986-01-01	4.137600000000000
1987-01-01	12.752400000000000
1988-01-01	19.585500000000000
1989-01-01	17.922800000000000
1990-01-01	16.749700000000000
1991-01-01	17.991900000000000
1992-01-01	40.809500000000000
1993-01-01	61.779900000000000
1994-01-01	58.153600000000000
1995-01-01	42.142300000000000
1996-01-01	18.050800000000000
1997-01-01	7.521489999999999
1998-01-01	16.065600000000000
1999-01-01	24.420100000000000
2000-01-01	21.656100000000000
2001-01-01	20.295100000000000
2002-01-01	27.376100000000000
2003-01-01	48.377500000000000
2004-01-01	65.476900000000000
2005-01-01	55.350300000000000
2006-01-01	43.795100000000000
2007-01-01	41.620800000000000
2008-01-01	39.576400000000000
2009-01-01	40.951800000000000
2010-01-01	52.834100000000000
2011-01-01	60.917000000000000
2012-01-01	56.871300000000000
2013-01-01	70.350000000000000
2014-01-01	79.462300000000000
2015-01-01	70.550900000000000
2016-01-01	71.502500000000000
2017-01-01	74.322900000000000