Year Percent 2000-01-01 0.2367229 2001-01-01 0.3036152 2002-01-01 0.4447577 2003-01-01 2.8316710 2004-01-01 4.3396570 2005-01-01 8.7787480 2006-01-01 13.5537900 2007-01-01 16.5613300 2008-01-01 19.8680300 2009-01-01 21.9220300 2010-01-01 39.9523700