Year,Annual mean,5 year mean
2003,0.57,0.55
2004,0.9,1.56
2005,0.63,0.57
2006,0.56,0.54
2007,0.59,1.56
2008,0.44,0.56
2009,0.57,0.55
2010,0.64,0.54
2011,0.2,,0.94
2012,0.52,