Year current US$ 2000 0.02341125 2001 0.06472228 2002 1.17671798 2003 2.40474901 2004 1.98284739 2005 1.98739479 2006 1.70365975 2007 1.4443507 2008 0.22880287 2009 0.18629999 2010 0.2836361 2011 0.76761139 2012 2.87613498