Last updated: September 19, 2022

Contact: ENV.Stat@oecd.org

Data for non-OECD countries may be found at the UN Statistical Division: UNSD, Country Files from the UNSD/UNEP data collection on environment statistics (available at: https://unstats.un.org/unsd/envstats/country_files).

Australia: Long-term annual average 1911-12 to 2019-20. For more information see http://www.bom.gov.au/water/rwi/#ro_tt/001/2020

Austria: Long-term annual average 1986-2015

Belgium: Long-term annual average 2000-20

Canada: Long-term annual average 1971-2004

Chile: Long-term annual average 2000-2014

Colombia: Long-term annual average 1971-2004

Costa Rica: The long-term annual average refers to 2001-2017

Czech Republic: Long-term annual average 1981-2010

Denmark: Long-term annual average 1995-2015

Finland: Long-term annual average 1981-2010

France: Long-term annual average: 1981-2010. Data exclude oversea territories. Inflow and outflow data exclude flows of underground water and of the Rhine river.

Germany: Long-term annual average 1995-2015

Hungary: Long-term annual average 1981-2010

Ireland: Long-term annual average 1981-2010. Inflow and outflow: data refers to flows of two main rivers crossing with Norther Ireland. Groundwater available for annual abstraction was estimated taking 10% of "Recharge into the Aquifer" (period 1971-2000). Freshwater resources 95% of years was estimated by taking the second lowest annual figure for "Total Renewable Freshwater Resources" over the previous 20 years.

Israel: Long-term annual average 2000-2013

Italy: Long-term annual average 1981-2010. Internal flow is the difference between total inflow (rain and snowmelt) and actual evapotranspiration.

Japan: Long-term annual average 1986-2015

Korea: Long-term annual average 1986-2015

Latvia: Long-term annual average 1961-2010. Water resources in lakes and reservoirs are not included in the volume of the total renewable freshwater resources

Lithuania: Long-term annual average 2000-2015. Evapotranspiration is estimated from one station only in the middle of the country.

Mexico: The long-term annual average covers the period 1981-2010 for precipitations, the other values are annual.

Netherlands: Long-term annual average 1981-2010. Actual evapotranspiration refers to "reference crop evapotranspiration", and therefore internal flow is calculated as precipitation minus reference crop evapotranspiration. It should be noted that in general this results in a lower value for Internal Flow and resulting (Internal) Renewable Fresh Water Resources.

New Zealand: Long-term annual average 1995-2014

Norway: Long-term annual average 1981-2010.

Poland: Long-term annual average 1981-2010.

Portugal: data on precipitation excludes overseas territories and evapotranspiration is potential, not actual.

Slovak Republic: Long-term annual average is 1961-2000

Slovenia: Long-term annual average is 1971-2000

Sweden: Long-term annual average: 1990-2020. For more information see https://www.smhi.se/data/hydrologi/vattenwebb/om-data-i-vattenwebb/kalibrering-och-utvardering-av-s-hype-1.26735

Switzerland: Long-term annual average: 1981-2010

Türkiye: Long-term annual average: past 30 years

Russia: The long-term annual average refers to 1936-1980