Sentence:  `` All too frequently '' , points out James O' Gara , managing editor of Commonweal , `` Catholics run roughshod over Protestant sensibilities in this matter , by failure to consider the reasoning behind the Protestant position and , particularly , by their jibes at the fact that Protestant opinion on birth control has changed in recent <WSD>decades</WSD> '' . 
Meaning of the word marked with <WSD> tags:  a period of 10 years