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| Rocky Mountain (PADD 4) Number of Operating Refineries as of January 1 (Number of Elements) | |||||
| Decade | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1980's | 27 | 21 | 19 | 20 | 18 | 17 | 17 | 17 | ||
| 1990's | 17 | 17 | 16 | 16 | 16 | 15 | NA | 15 | NA | 16 |
| 2000's | 15 | 15 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 |
| 2010's | 15 | 16 | 17 | 17 | 17 | 17 | 16 | 16 | 15 | 16 |
| 2020's | 16 | 15 | 15 | 13 | 15 | 15 |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 6/20/2025 |
| Next Release Date: June 2026 |