| MONTH | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | MO. AVG. | |
| JAN. | $27.01 | $29.26 | $19.73 | $32.70 | $34.22 | $46.85 | $65.54 | $54.35 | $92.93 | $44.73 | |
| FEB. | $29.30 | $29.64 | $20.76 | $35.73 | $34.50 | $48.05 | $61.93 | $59.39 | $89.85 | $45.46 | |
| MAR. | $29.89 | $27.27 | $24.44 | $33.16 | $36.72 | $54.63 | $62.97 | $60.74 | $100.74 | $47.84 | |
| APR. | $25.54 | $27.62 | $26.26 | $28.14 | $36.62 | $53.22 | $70.16 | $64.04 | $104.40 | $48.44 | |
| MAY. | $28.81 | $28.68 | $26.95 | $28.07 | $40.28 | $49.87 | $70.96 | $63.53 | $119.37 | $50.72 | |
| JUN. | $31.53 | $27.59 | $25.55 | $30.52 | $38.05 | $56.42 | $70.97 | $67.53 | $129.07 | $53.03 | |
| JUL. | $29.72 | $26.47 | $26.94 | $30.70 | $40.81 | $59.03 | $74.46 | $74.15 | $134.62 | $55.21 | |
| AUG. | $31.14 | $27.31 | $28.20 | $31.60 | $44.88 | $64.99 | $73.08 | $72.36 | $127.95 | $55.72 | |
| SEP. | $33.87 | $25.69 | $29.67 | $28.31 | $45.94 | $65.55 | $63.90 | $79.63 | $114.98 | $54.17 | |
| OCT. | $32.93 | $22.21 | $28.86 | $30.35 | $53.09 | $62.27 | $59.14 | $85.66 | $120.92 | $55.05 | |
| NOV. | $34.26 | $19.67 | $26.19 | $31.06 | $48.48 | $58.34 | $59.40 | $94.63 | $70.89 | $49.21 | |
| DEC. | $28.40 | $19.40 | $29.39 | $32.14 | $43.26 | $59.45 | $62.09 | $91.74 | $45.73 | ||
| YR.'S AVG. | $30.20 | $25.90 | $26.08 | $31.04 | $41.40 | $56.56 | $66.22 | $72.31 | $109.61 | $50.44 | |
| 1st Qtr. | $28.73 | $28.72 | $21.64 | $33.86 | $35.15 | $49.84 | $63.48 | $58.16 | $94.51 | $46.01 | |
| 2nd Qtr. | $28.63 | $27.96 | $26.25 | $28.91 | $38.32 | $53.17 | $70.70 | $65.03 | $117.61 | $50.73 | |
| 3rd Qtr. | $31.58 | $26.49 | $28.27 | $30.20 | $43.88 | $63.19 | $70.48 | $75.38 | $125.85 | $55.04 | |
| 4th Qtr. | $31.86 | $20.43 | $28.15 | $31.18 | $48.28 | $60.02 | $60.21 | $90.68 | $95.91 | $51.86 |