The average price of coal increased 9 cents per million Btu from 2010 to 2011. The industrial sector price fell 2 cents, but the electric power sector price increased 9 cents. The residential sector, the commercial sector, and the transportation sector price had no reported prices.
The transportation sector price paralleled the commercial and industrial sectors' prices from 1970 to 1977 with the last reported price for the transportation sector in 1977. If coal was consumed in the transportation sector after 1977, the amount rounded to zero, so a price was not reported.
The commercial and industrial prices paralleled each other from 1970 to 1998 and again from 2001 to 2007.
If coal was consumed in the commercial and residential sectors in 1999, 2000, 2008, 2009, 2010, and 2011, the amount rounded to zero, so a price was not reported.