Commodity2005200620072008200920102011
Chalk$6,512,563$8,189,914$9,093,212$9,762,444$8,965,793$8,487,266$8,725,888
Total$6,512,563$8,189,914$9,093,212$9,762,444$8,965,793$8,487,266$8,725,888