question: The amount of material used as a crop protection measure decreased from 1kg/ha in what year to its current 1 % ?
answer: 1960s
turker_answer: The amount of material used as a crop protection measure decreased from 1kg/ha in the 1960s to its current 1 % .
rule-based: The amount of material used as a crop protection measure decreased from 1kg/ha in 1960s to its current 1 % .