Floods are one of Europe's most widespread disasters. Major flooding has occurred nearly every year somewhere on our continent during the last few decades.
Major flooding has occurred every year during the last few decades.
Its incorrect because it states the major flooding happened nearly every year, not every year. Maybe that distinction was too difficult for the system.
( z1 flood :ARG1-of ( z2 major ) :frequency ( z3 rate-entity :ARG2 ( z4 temporal-quantity :quant 1 :unit ( z5 year ) ) ) :time ( z6 before :op ( z7 now ) :duration ( z8 few :op ( z9 temporal-quantity :quant 1 :unit ( z10 decade ) ) ) ) )