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| Rocky Mountain (PADD 4) Isobutane-Isobutylene Stocks at Refineries (Thousand Barrels) | ||||||||
| Decade | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1990's | 126 | 105 | 127 | 89 | 81 | 133 | 139 | |||
| 2000's | 75 | 80 | 67 | 86 | 75 | 73 | 61 | 87 | 66 | 95 |
| 2010's | 98 | 106 | 94 | 86 | 111 | 143 | 100 | 101 | 88 | 84 |
| 2020's | 77 | 97 | -- | -- | -- |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 12/31/2025 |
| Next Release Date: 8/31/2026 |