The total area of the wilkins ice shelf at the end of feb 2008 was about 14000km squared. It started to disintegrate at the begining of march 2008. By the end of nov 2008 about 2000km squared had disintegrated. Calculate the percentage of the wilkins ice shelf that disintegrated between the begining of march 2008 and the end of nov 2008 (assume the above data are given to two significant figures)