Year 1=low to 6=high 2005 2 2006 2 2007 2 2008 2 2009 2 2010 2 2011 2 2012 2 2013 1.5 2014 1.5 2015 1.5 2016 1 2017 1 2018 1 2019 1 2020 1 2021 1 2022 1 2023 1