several nations estimate sectoral distribution of use of water withdrawn from surface and groundwater sources. for example, in canada, in 2005, 42 billion m³ of withdrawn water were used, of which about 38 billion m³ were freshwater. distribution of this use among sectors was: thermoelectric power generation 66.2%, manufacturing 13.6%, residential 9.0%, agriculture 4.7%, commercial and institutional 2.7%, water treatment and distribution systems 2.3%, mining 1.1%, and oil and gas extraction 0.5%. the 38 billion cu.m of freshwater withdrawn in that year can be compared with the nation's annual freshwater yield (estimated as streamflow) of 3,472 billion cu.m. sectoral distribution is different in many respects in the us, where agriculture accounts for about 39% of fresh water withdrawals, thermoelectric power generation 38%, industrial 4%, residential 1%, and mining (including oil and gas) 1%.