According to the bar graph, Difference of the rainfall, in 2005−2006 =50−40=10cm Difference of the rainfall in 2006−2007 =100−50=50cm Difference of the rainfall in 2007−2008 =100−80=20cm Difference of the rainfall in 2008−2009 =80−20=60cm Difference of the rainfall in 2009−2010 =120−20=100cm ∴ Difference of the rainfall was minimum in 2005-2006.