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| Rocky Mountain (PADD 4) Product Supplied of Isobutane-Isobutylene (Thousand Barrels per Day) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1989 | 1 | 1 | 1 | 1 | -1 | -5 | -6 | -3 | -1 | -2 | -1 | 0 |
| 1990 | 0 | 1 | 1 | -3 | -2 | -1 | -1 | -2 | -1 | -3 | 0 | 0 |
| 1991 | -1 | -1 | -3 | 1 | 2 | -1 | -1 | 0 | -1 | 2 | 1 | 3 |
| 1992 | 2 | 1 | 1 | 1 | 0 | 3 | -2 | 0 | -1 | -1 | 4 | 2 |
| 1993 | 1 | 0 | -1 | -1 | -1 | -3 | 1 | 0 | 2 | -1 | 0 | |
| 1994 | 0 | 0 | -1 | 1 | -1 | -3 | -3 | -3 | -4 | -2 | 0 | 0 |
| 1995 | 1 | -1 | 0 | -3 | -3 | -4 | -3 | -4 | -5 | -3 | -1 | -3 |
| 1996 | -2 | -1 | -4 | -5 | -4 | -2 | -4 | -7 | -5 | -3 | -3 | -3 |
| 1997 | -2 | -2 | -5 | -5 | -4 | -6 | -5 | -6 | -5 | -3 | -2 | -3 |
| 1998 | -4 | -4 | -5 | -5 | -6 | -7 | -8 | -7 | -5 | -5 | -3 | -4 |
| 1999 | -3 | -3 | -5 | -6 | -7 | -7 | -5 | -6 | -6 | -2 | -2 | -5 |
| 2000 | -1 | -3 | -3 | -3 | -8 | -7 | -7 | -6 | -6 | -7 | -5 | -2 |
| 2001 | -3 | -4 | -2 | -4 | -4 | -8 | -7 | -7 | -5 | -4 | -5 | -5 |
| 2002 | -5 | -5 | -7 | -5 | -7 | -9 | -11 | -9 | -7 | -5 | -6 | -6 |
| 2003 | -6 | -1 | -5 | -3 | -9 | -9 | -9 | -7 | -9 | -5 | -6 | -4 |
| 2004 | -4 | -4 | -6 | -3 | -7 | -9 | -8 | -9 | -9 | -6 | -6 | -5 |
| 2005 | -5 | -5 | -8 | -7 | -9 | -8 | -8 | -11 | -6 | -7 | -6 | -3 |
| 2006 | -7 | -5 | -9 | -12 | -11 | -11 | -10 | -10 | -11 | -11 | -9 | -7 |
| 2007 | -7 | -9 | -9 | -11 | -14 | -12 | -11 | -12 | -12 | -11 | -11 | -8 |
| 2008 | -10 | -9 | -11 | -12 | -10 | -13 | -7 | -12 | -11 | -10 | -11 | -7 |
| 2009 | -13 | -11 | -12 | -12 | -14 | -13 | -16 | -15 | -17 | -13 | -13 | -13 |
| 2010 | -14 | -16 | -11 | -16 | -18 | -14 | -15 | -16 | -15 | -17 | -16 | -11 |
| 2011 | -11 | -11 | -14 | -13 | -16 | -14 | -13 | -13 | -14 | -15 | -13 | -10 |
| 2012 | -13 | -13 | -15 | -15 | -17 | -17 | -17 | -16 | -14 | -12 | -10 | -6 |
| 2013 | -8 | -13 | -11 | -10 | -10 | -12 | -16 | -12 | -10 | -10 | -12 | -9 |
| 2014 | -10 | -9 | -11 | -13 | -15 | -11 | -15 | -15 | -17 | -12 | -10 | -9 |
| 2015 | -10 | -11 | -13 | -11 | -9 | -11 | -15 | -10 | -11 | -10 | -10 | -12 |
| 2016 | -7 | -5 | -7 | -9 | -7 | -9 | -9 | -9 | -7 | -4 | -11 | -9 |
| 2017 | -5 | -6 | -6 | -9 | -7 | -7 | -9 | -8 | -12 | -8 | -9 | -7 |
| 2018 | -5 | -8 | -11 | -10 | -8 | -7 | -7 | -5 | -10 | -4 | -10 | -6 |
| 2019 | -2 | -7 | -3 | 0 | -8 | -2 | -1 | 2 | 2 | 2 | 4 | 4 |
| 2020 | -9 | -11 | 1 | -5 | -5 | -4 | -7 | -4 | -3 | -5 | -5 | 2 |
| 2021 | -3 | -3 | -1 | -6 | -3 | -16 | -4 | -3 | -7 | -10 | -30 | -7 |
| 2022 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2023 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2024 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2025 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 2/27/2026 |
| Next Release Date: 3/31/2026 |