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| Rocky Mountain (PADD 4) Refinery and Blender Net Production of Isobutylene (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1993 | W | |||||||||||
| 1995 | W | W | W | W | W | W | W | W | W | W | W | W |
| 1996 | W | W | W | W | W | W | W | W | W | W | W | W |
| 1997 | W | W | W | W | W | W | W | W | W | W | W | W |
| 1998 | W | W | W | W | W | W | W | W | W | W | W | W |
| 1999 | W | W | W | W | W | W | W | W | W | W | W | W |
| 2000 | W | W | W | W | W | W | W | W | W | W | W | W |
| 2001 | W | W | W | W | W | W | W | W | W | W | W | W |
| 2002 | W | W | W | W | W | W | W | W | W | W | W | W |
| 2003 | W | W | W | W | W | W | W | W | W | W | W | W |
| 2010 | 2 | 1 | 1 | 1 | ||||||||
| 2012 | 1 | |||||||||||
| 2018 | -3 | |||||||||||
| 2019 | -3 | -18 | ||||||||||
| - = 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: 11/28/2025 |