Commodity2005200620072008200920102011
Chalk$13,924,659$14,040,791$16,888,923$20,586,130$19,395,308$30,951,202$27,024,268
Total$13,924,659$14,040,791$16,888,923$20,586,130$19,395,308$30,951,202$27,024,268