Borg, I.Y.; Briggs, C.K. - 2008
depended on petroleum for 41 % of its energy supply. Imports of crude oil and petroleum products increased to compensate for … decline in domestic production. Imports rose to 44% of supply. Because domestic production of natural gas was close to 1991`s …, increased demand was accommodated by larger (16%) imports from Canada. Coal production was virtually unchanged from 1991 and …