The OECD (2004) has therefore assessed water resources to be under moderate stress. Estimates of long-term annual averages of renewable freshwater resources which aggregate the quantity of water received from precipitation (net of evapotranspiration) and from inflowing rivers from neighbouring countries. However, in recent decades the weight of agriculture has much diminished, with the share in economic activity dropping to 2*6 per cent, a share similar to that observed in other high-income countries. The value added of related manufacturing amounts to an additional 2% of GDP.