Year	Percent
1988-01-01	111.5640
1989-01-01	39.1550
1990-01-01	44.2601
1991-01-01	86.8990
1992-01-01	67.9147
1993-01-01	56.7835
1994-01-01	49.0256
1995-01-01	52.0965
1996-01-01	59.2949
1997-01-01	71.3649
1998-01-01	78.7421
1999-01-01	80.6359
2000-01-01	75.6622
2001-01-01	66.6477
2002-01-01	56.3458
2003-01-01	48.9800
2004-01-01	43.9526
2005-01-01	46.4015
2006-01-01	53.8401
2007-01-01	51.8109
2008-01-01	56.4324
2009-01-01	66.6491
2010-01-01	71.2847
2011-01-01	71.2654
2012-01-01	66.4073
2013-01-01	66.9083
2014-01-01	70.8269
2015-01-01	69.8185
2016-01-01	69.8798