Year Percent 2000 0.014 2001 0.016 2002 0.015 2003 0.015 2004 0.015 2005 0.015 2006 0.015 2007 0.015 2008 0.015 2009 0.016 2010 0.015 2011 0.015 2012 0.015 2013 0.015 2014 0.015 2015 0.015 2016 0.015 2017 0.015 2018 0.015 2019 0.016 2020 0.016 2021 0.016 2022 0.016 2023 0.016 2024 0.016