Year Percent 1995-01-01 2.29632000000000000 1996-01-01 19.58570000000000000 1997-01-01 36.20280000000000000 1998-01-01 39.56730000000000000 1999-01-01 45.53830000000000000 2000-01-01 44.51460000000000000 2001-01-01 31.74180000000000000 2002-01-01 20.75290000000000000 2003-01-01 13.38370000000000000 2004-01-01 12.18130000000000000 2005-01-01 5.46620000000000000 2006-01-01 3.95034000000000000 2007-01-01 2.64526000000000000 2008-01-01 1.30244000000000000 2009-01-01 1.22190000000000000 2010-01-01 0.60501900000000000 2011-01-01 0.87571300000000000 2012-01-01 0.77920100000000000 2013-01-01 0.45638199999999995