Year SPI (scale 0-100) 2004 20 2005 20 2006 20 2007 20 2008 20 2009 20 2010 40 2011 40 2012 40 2013 40 2014 40 2015 50 2016 50 2017 70 2018 70 2019 70 2020 70 2021 70 2022 70