Year	Percent
1992-01-01	6.662560000000001
1993-01-01	5.254030000000000
1994-01-01	5.557800000000000
1995-01-01	6.922370000000000
1996-01-01	6.898760000000000
1997-01-01	9.082020000000000
1998-01-01	13.109100000000000
1999-01-01	15.639600000000000
2000-01-01	16.870400000000000
2001-01-01	19.346200000000000
2002-01-01	26.507800000000000
2003-01-01	29.203100000000000
2004-01-01	26.990700000000000
2005-01-01	24.087700000000000
2006-01-01	30.166100000000000
2007-01-01	43.913900000000000
2008-01-01	41.250100000000000
2009-01-01	38.049900000000000
2010-01-01	31.562800000000000
2011-01-01	26.832800000000000
2012-01-01	28.455300000000000