Year % 1997 1.98237885462555 1998 1.98237885462555 1999 1.98237885462555 2000 1.98237885462555 2001 2.42290748898678 2002 2.42290748898678 2003 2.42290748898678 2004 2.86343612334802 2005 1.98237885462555 2006 2.03619909502262 2007 1.80995475113122 2008 1.80995475113122 2009 1.76211453744493 2010 12.6953125 2011 1.96850393700787 2012 1.96850393700787 2016 14.9328859060403 2017 14.9328859060403 2018 14.9328859060403 2019 14.9328859060403 2020 27.4111675126904 2021 27.7027027027027 2022 27.580372250423 2023 27.5337837837838