Year	Percent
1989-01-01	43.7891
1990-01-01	43.7891
1991-01-01	43.7891
1992-01-01	43.7891
1993-01-01	43.0308
1994-01-01	41.1796
1995-01-01	41.7163
1996-01-01	50.7420
1997-01-01	79.3352
1998-01-01	99.7228
1999-01-01	70.7535
2000-01-01	51.7029
2001-01-01	59.7748
2002-01-01	70.7983
2003-01-01	96.8924
2004-01-01	112.2350
2005-01-01	109.1660
2006-01-01	102.9610
2007-01-01	136.9590
2008-01-01	106.1710
2009-01-01	92.0923
2010-01-01	92.8083
2011-01-01	72.9551
2012-01-01	56.7387