Year 1=low to 6=high 2005 4.25 2006 4.25 2007 4.25 2008 4 2009 4.25 2010 4.25 2011 4 2012 4 2013 4 2014 4 2015 3.5 2016 3.5 2017 3.5 2018 3.25 2019 3.25 2020 3 2021 3 2022 3 2023 3