Year	Percent
1983-01-01	28.77140000000000
1984-01-01	31.32430000000000
1985-01-01	41.24460000000000
1986-01-01	39.48340000000000
1987-01-01	41.38120000000000
1988-01-01	44.61590000000000
1989-01-01	52.04500000000000
1990-01-01	59.04120000000000
1991-01-01	58.30750000000000
1992-01-01	56.37290000000000
1993-01-01	53.51940000000000
1994-01-01	49.96880000000000
1995-01-01	49.03690000000000
1996-01-01	43.98740000000000
1997-01-01	60.94320000000000
1998-01-01	60.19840000000000
1999-01-01	74.36590000000000
2000-01-01	101.88799999999999
2001-01-01	90.68340000000000
2002-01-01	77.61650000000000
2003-01-01	111.05799999999999
2004-01-01	127.38799999999999
2005-01-01	143.80200000000002
2006-01-01	200.99099999999999
2007-01-01	280.58200000000000
2008-01-01	216.56000000000000
2009-01-01	256.54700000000000
2010-01-01	223.24400000000003
2011-01-01	250.61400000000000
2012-01-01	265.85800000000000
2013-01-01	201.63700000000000
2014-01-01	159.51500000000000
2015-01-01	170.78400000000002
2016-01-01	161.37800000000000