Change in the prevalence of anthelmintic resistance (= proportion of farms testing positive) for benzimidazoles (BZ) in Switzerland (CH; dotted black line) and the United Kingdom (UK; dashed red line), and macrocyclic lactones excluding moxidectin (MOX) in the United Kingdom (solid blue line). Only studies testing more than one farm were included. For regression equations, see https://www.parasite-journal.org/10.1051/parasite/2020062">Table S4(a–c). Data point for CH-BZ at (2016, 1) is partly concealed.