Electricity generation. The production of electricity in 2013 was 23,322TWh. Sources of electricity were coal and peat 41%, natural gas 22%, hydroelectric 16%, nuclear power 11%, oil 4%, biomass and waste 2% and other sources 4%.
The nine Supreme Court Justices on the Supreme Court of the United States are the final arbiters on whether or not a law passed by the legislative branch is constitutional.
Before settling at nine in 1869, the number of Supreme Court Justices changed six times. In its entire history, the Supreme Court has had only 16 Chief Justices, and over 100 Associate Justices.