Year	Percent
1998-01-01	4.82697388994681
1999-01-01	4.69082429074762
2000-01-01	4.37386476974954
2001-01-01	3.95683977724728
2002-01-01	3.76535650462514
2003-01-01	3.64814758149451
2004-01-01	3.41312175280228
2005-01-01	3.25205595066279
2006-01-01	2.86389652341300
2007-01-01	2.55770556684042
2008-01-01	2.85143669679632
2009-01-01	3.25477704066217
2010-01-01	3.50107650086228
2011-01-01	3.49373446508289
2012-01-01	4.53377726038141
2013-01-01	5.13065776932579