Year	Percent
1990-01-01	42.953700000000000
1991-01-01	50.898800000000000
1992-01-01	50.057200000000000
1993-01-01	48.430900000000000
1994-01-01	53.757900000000000
1995-01-01	54.230400000000000
1996-01-01	47.370800000000000
1997-01-01	41.523000000000000
1998-01-01	43.086000000000006
1999-01-01	43.601600000000000
2000-01-01	39.878500000000000
2001-01-01	28.868100000000000
2002-01-01	18.042600000000000
2003-01-01	16.614000000000000
2004-01-01	15.895400000000000
2005-01-01	23.948000000000000
2006-01-01	38.323100000000000
2007-01-01	56.444700000000000
2008-01-01	67.694200000000000
2009-01-01	65.398100000000000
2010-01-01	65.063500000000000
2011-01-01	71.001000000000000
2012-01-01	75.282000000000000
2013-01-01	79.848700000000000
2014-01-01	81.061700000000000
2015-01-01	81.657500000000000
2016-01-01	78.678500000000000