How much did the sideline bring the farmer family in last year?

去年副业使这家农户增加了多少收入?

The dairy farming in Hokkaido has beeing developed rapidly since 50's in twertieth century, the scale of daing farm has beeing extended constantly while the family number of dairy farmer is decreased.

摘要北海道奶牛业2050年代开始快速发展，奶农户数减少的时经营规模不断扩大。