Developers

Year Nitrate Max Nitrate Mean
2008 34.3 27.2
2009 46.6 26.8
2010 37 26.3
2011 34.3 23.8
2012 27.2 23.4
2013 39.2 31.2
2014 41.1 28.2
2015 36.4 26.2
2016 30.2 21.7
2017 29.9 22.5