| MONTH | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | MO. AVG. |
| JAN. | $29.26 | $19.73 | $32.70 | $34.22 | $46.85 | $65.54 | $54.35 | $92.93 | $33.87 | $72.47 | $48.19 |
| FEB. | $29.64 | $20.76 | $35.73 | $34.50 | $48.05 | $61.93 | $59.39 | $89.85 | $38.74 | $77.62 | $49.62 |
| MAR. | $27.27 | $24.44 | $33.16 | $36.72 | $54.63 | $62.97 | $60.74 | $100.74 | $38.94 | $80.16 | $51.98 |
| APR. | $27.62 | $26.26 | $28.14 | $36.62 | $53.22 | $70.16 | $64.04 | $104.40 | $51.06 | $51.28 | |
| MAY. | $28.68 | $26.95 | $28.07 | $40.28 | $49.87 | $70.96 | $63.53 | $119.37 | $46.51 | $52.69 | |
| JUN. | $27.59 | $25.55 | $30.52 | $38.05 | $56.42 | $70.97 | $67.53 | $129.07 | $59.65 | $56.15 | |
| JUL. | $26.47 | $26.94 | $30.70 | $40.81 | $59.03 | $74.46 | $74.15 | $134.62 | $66.93 | $59.35 | |
| AUG. | $27.31 | $28.20 | $31.60 | $44.88 | $64.99 | $73.08 | $72.36 | $127.95 | $64.72 | $59.45 | |
| SEP. | $25.69 | $29.67 | $28.31 | $45.94 | $65.55 | $63.90 | $79.63 | $114.98 | $72.54 | $58.47 | |
| OCT. | $22.21 | $28.86 | $30.35 | $53.09 | $62.27 | $59.14 | $85.66 | $120.92 | $71.55 | $59.34 | |
| NOV. | $19.67 | $26.19 | $31.06 | $48.48 | $58.34 | $59.40 | $94.63 | $70.89 | $79.09 | $54.19 | |
| DEC. | $19.40 | $29.39 | $32.14 | $43.26 | $59.45 | $62.09 | $91.74 | $49.62 | $76.72 | $51.53 | |
| YR.'S AVG. | $25.90 | $26.08 | $31.04 | $41.40 | $56.56 | $66.22 | $72.31 | $104.61 | $58.36 | $76.75 | $54.35 |
| 1st Qtr. | $28.72 | $21.64 | $33.86 | $35.15 | $49.84 | $63.48 | $58.16 | $94.51 | $37.18 | $76.75 | $49.93 |
| 2nd Qtr. | $27.96 | $26.25 | $28.91 | $38.32 | $53.17 | $70.70 | $65.03 | $117.61 | $52.41 | $53.37 | |
| 3rd Qtr. | $26.49 | $28.27 | $30.20 | $43.88 | $63.19 | $70.48 | $75.38 | $125.85 | $68.06 | $59.09 | |
| 4th Qtr. | $20.43 | $28.15 | $31.18 | $48.28 | $60.02 | $60.21 | $90.68 | $80.48 | $75.79 | $55.02 |