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Note: These data are available in spreadsheet format by clicking the ''Download Series History'' link on the previous page (with drop-down menu bar at top).
 View History:    Monthly     Annual   
Rocky Mountain (PADD 4) Isobutane-Isobutylene Ending Stocks (Thousand Barrels)
Decade Year-0 Year-1 Year-2 Year-3 Year-4 Year-5 Year-6 Year-7 Year-8 Year-9
  1980's 103 59 52 85 76 120 136 123 131
  1990's 140 140 172 209 152 177 143 134 189 242
  2000's 185 182 224 191 164 158 136 172

Updated on 6/26/2008
Source: U.S. Energy Information Administration
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