Commodity2005200620072008200920102011
Chalk$21,646,000$30,817,000$72,861,000$28,241,000$19,484,000$15,923,499$16,218,906
Total$21,646,000$30,817,000$72,861,000$28,241,000$19,484,000$15,923,499$16,218,906