Time Mean GRACE based ocean mass (mm) 2005.50 -5.59 2006.50 -5.41 2007.50 -3.93 2008.50 -2.20 2009.50 -0.27 2010.50 1.87 2011.50 2.03 2012.50 8.13 2013.50 9.89 2014.50 10.36 2015.50 16.88 2016.50 21.01