The researchers compared the average annual yield of aroma hops during the periods 1971-1994 and 1995-2018 and found " a significant production decrease" of 0.13-0.27 tons per hectare.

研究人员对比 1971-1994 年间和 1995-2018 年间的香味啤酒花年均产量后发现，每公顷减产 0.13 至 0.27 吨，“产量显著下降”。