Year Percent 2000 51.25695 2001 51.25695 2002 51.25695 2003 51.25695 2004 51.25695 2005 50.96045 2006 50.66052 2007 50.35716 2008 50.05037 2009 49.74016 2010 49.42651 2011 49.10944 2012 48.78894 2013 48.46502 2014 48.13766 2015 47.80688 2016 47.47267 2017 47.13503 2018 46.79396 2019 46.44946 2020 46.10154 2021 45.75018 2022 45.3954