Year SPI (scale 0-100) 2004 20 2005 20 2006 0 2007 0 2008 0 2009 0 2010 20 2011 20 2012 20 2013 20 2014 20 2015 20 2016 26.6 2017 40 2018 40 2019 40 2020 40 2021 60 2022 60