The figure 'Population trends of farmland birds in the Netherlands' shows the population trend of farmland birds over the period 1960 - 2023. There is a measurement series based on estimates from 1960 to 1990. In the figure, this corresponds to the average index figures from 1990 to 2023. The first series starts at 184 in 1960 and ends at 105 in 1990. A trend line has been calculated through the series of average index figures from 1990 to 2023. This starts at 100 in 1990 and drops to 55 in 2023.