{"entity":{"iso2":"PL","iso3":"POL","name":"Poland","slug":"poland"},"indicator":{"licence":"CC BY 4.0 (Our World in Data)","slug":"annual-change-hydro","source":"Energy Institute - Statistical Review of World Energy (2026); Smil (2017) \u2013 with major processing by Our World in Data","source_url":"https://ourworldindata.org/grapher/annual-change-hydro","title":"Annual change in primary energy from hydropower","unit":"terawatt-hours"},"observations":[{"date":"1966-01-01","value":0.0},{"date":"1967-01-01","value":0.0609999},{"date":"1968-01-01","value":0.048},{"date":"1969-01-01","value":-0.195},{"date":"1970-01-01","value":0.961},{"date":"1971-01-01","value":-0.202},{"date":"1972-01-01","value":-0.066},{"date":"1973-01-01","value":-0.0470001},{"date":"1974-01-01","value":0.666},{"date":"1975-01-01","value":-0.132},{"date":"1976-01-01","value":-0.345},{"date":"1977-01-01","value":0.312},{"date":"1978-01-01","value":-0.00600004},{"date":"1979-01-01","value":-0.144},{"date":"1980-01-01","value":0.542},{"date":"1981-01-01","value":-0.212},{"date":"1982-01-01","value":-0.594},{"date":"1983-01-01","value":0.132},{"date":"1984-01-01","value":-0.267},{"date":"1985-01-01","value":0.444},{"date":"1986-01-01","value":-0.303},{"date":"1987-01-01","value":0.112},{"date":"1988-01-01","value":0.132},{"date":"1989-01-01","value":-0.184},{"date":"1990-01-01","value":-0.192},{"date":"1991-01-01","value":0.0079999},{"date":"1992-01-01","value":0.082},{"date":"1993-01-01","value":-0.0190001},{"date":"1994-01-01","value":0.245},{"date":"1995-01-01","value":0.154},{"date":"1996-01-01","value":0.044},{"date":"1997-01-01","value":0.0300001},{"date":"1998-01-01","value":0.348},{"date":"1999-01-01","value":-0.154},{"date":"2000-01-01","value":-0.049},{"date":"2001-01-01","value":0.219},{"date":"2002-01-01","value":-0.0460002},{"date":"2003-01-01","value":-0.608},{"date":"2004-01-01","value":0.411},{"date":"2005-01-01","value":0.119},{"date":"2006-01-01","value":-0.159},{"date":"2007-01-01","value":0.31},{"date":"2008-01-01","value":-0.199},{"date":"2009-01-01","value":0.222},{"date":"2010-01-01","value":0.545},{"date":"2011-01-01","value":-0.588},{"date":"2012-01-01","value":-0.295},{"date":"2013-01-01","value":0.402},{"date":"2014-01-01","value":-0.256},{"date":"2015-01-01","value":-0.351},{"date":"2016-01-01","value":0.307},{"date":"2017-01-01","value":0.421},{"date":"2018-01-01","value":-0.59},{"date":"2019-01-01","value":-0.0115839},{"date":"2020-01-01","value":0.159921},{"date":"2021-01-01","value":0.220845},{"date":"2022-01-01","value":-0.370995},{"date":"2023-01-01","value":0.441324},{"date":"2024-01-01","value":-0.294982},{"date":"2025-01-01","value":-0.58804}],"summary":{"latest_period":"2025-01-01","latest_value":-0.58804,"max":0.961,"mean":0.0105081,"min":-0.608,"of":77,"rank":52,"trend":"volatile"}}