Year Percent 1995-01-01 0.005072751 1996-01-01 0.007696877 1997-01-01 0.304721117 1998-01-01 0.947694957 1999-01-01 0.998120606 2000-01-01 0.637847126 2001-01-01 0.533344865 2002-01-01 0.673998058 2003-01-01 0.709616303 2004-01-01 0.908471107 2005-01-01 2.207133532 2006-01-01 3.172569990 2007-01-01 3.757835627 2008-01-01 2.867868423 2009-01-01 1.516327500 2010-01-01 1.072360277 2011-01-01 1.366964340 2012-01-01 1.464839339