Question 4 refers to the following data.

The population of the U.S. grew by 29% between 1979 and 2004, during which time per capita energy consumption doubled. If average per capita energy used from coal was 25 MBTUs in 1979, which of the following are in the range of per capita energy, measured in MBTUs, provided by a single fossil fuel (coal, natural gas or oil) in 2004 ?

Indicate all possible values.

1. 12
2. 25
3. 37
4. 41
5. 61
6. 79

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Percent of Total 40.0% 35.0% 30.0% 25.0% 20.0% 15.0% 10.0% 5.0% 0.0% Coul U.S. ENERGY SOURCES, 1979 AND 2004 1979 Total for 1979 - 18,509 2004 Total for 2004- 5.090 Natural Gas Nuclear Hydroelectric Biomass Geothermal Solar Energy Source Wind