Commodity2005200620072008200920102011
Chalk$42,101,425$44,878,424$48,253,378$46,520,741$38,220,332$38,841,581$41,086,628
Total$42,101,425$44,878,424$48,253,378$46,520,741$38,220,332$38,841,581$41,086,628