Commodity2005200620072008200920102011
Chalk$36,740,935$39,184,477$40,382,170$25,326,033$21,513,671$22,581,472$20,590,038
Total$36,740,935$39,184,477$40,382,170$25,326,033$21,513,671$22,581,472$20,590,038