Population trends of farmland birds in the European Union: The figure 'Population trends of farmland birds in the European Union' shows the population trend of farmland birds in the EU over the period 1980 - 2023. There is a series of measurements that show average indexes and a trend line through those points. The trend line starts at 133 in 1980 and drops via 100 in 1990 to 58 in 2023.