Year	Percent
1983-01-01	28.25330000000000
1984-01-01	31.44840000000000
1985-01-01	36.18010000000000
1986-01-01	50.06000000000000
1987-01-01	47.81790000000000
1988-01-01	39.81760000000000
1989-01-01	39.43610000000000
1990-01-01	34.99740000000000
1991-01-01	37.52370000000000
1992-01-01	42.63690000000000
1993-01-01	40.86860000000000
1994-01-01	42.64310000000000
1995-01-01	40.81750000000000
1996-01-01	43.02880000000000
1997-01-01	42.98620000000000
1998-01-01	27.64810000000000
1999-01-01	53.17350000000000
2000-01-01	51.04180000000000
2001-01-01	57.49790000000000
2002-01-01	59.44780000000000
2003-01-01	133.49200000000002
2004-01-01	154.56600000000000
2005-01-01	135.63600000000000
2006-01-01	176.66700000000000
2007-01-01	175.61900000000003
2008-01-01	159.98200000000000
2009-01-01	226.07800000000000
2010-01-01	201.04300000000000
2011-01-01	173.59799999999998
2012-01-01	174.06700000000000
2013-01-01	168.96500000000000
2014-01-01	159.74600000000000
2015-01-01	171.84700000000000
2016-01-01	177.30500000000000