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| Rocky Mountain (PADD 4) Isobutane-Isobutylene Stocks at Natural Gas Processing Plants (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 | 20 | 8 | 12 | 16 | 14 | 16 | 16 | |||
| 2000's | 22 | 14 | 69 | 17 | 21 | 15 | 11 | 21 | 10 | 10 |
| 2010's | 6 | 6 | 7 | 9 | 9 | 9 | 9 | 10 | 11 | 18 |
| 2020's | 13 | 21 | -- | -- | -- |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 10/31/2025 |
| Next Release Date: 8/31/2026 |