Microwaves in U.S. households
In 1978, only eight percent of U.S. households had microwave ovens. As of 2006 over 80 percent have them.

Reference: http://www.powerhousetv.com/
More united states facts.
In 1978, only eight percent of U.S. households had microwave ovens. As of 2006 over 80 percent have them.
Ninety-nine percent of the natural gas used in the United States comes from North America.
Natural gas provides 24 percent of all the energy used in the United States