Year Total Agricultural Other sources
2010 3.6 3.3 0.3
2011 3.5 3.3 0.2
2012 3.5 3.3 0.2
2013 3.5 3.3 0.2
2014 3.5 3.3 0.2
2015 3.6 3.3 0.2
2016 3.6 3.3 0.2
2017 3.6 3.4 0.2
2018 3.6 3.3 0.2
2019 3.5 3.3 0.2
2020 3.4 3.2 0.2