Year SPI (scale 0-100) 2005 16.34375 2006 15.59375 2007 15.59375 2008 16.86875 2009 15.45625 2010 16.5625 2011 16.60625 2012 16.45 2013 15.9875 2014 16.65625 2015 18.7 2016 18.93125 2017 18.26875 2018 21.11875 2019 21.61875 2020 28.34375 2021 38.08125 2022 38.08125