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| Rocky Mountain (PADD 4) Stocks in Pipelines of Isobutane (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1993 | 64 | 63 | 68 | 68 | 67 | 91 | 68 | 67 | 63 | 63 | 63 | 63 |
| 1994 | 39 | 39 | 43 | 44 | 44 | 42 | 41 | 40 | 40 | 40 | 39 | 39 |
| 1995 | 38 | 39 | 40 | 40 | 41 | 42 | 40 | 41 | 41 | 40 | 38 | 38 |
| 1996 | 38 | 38 | 39 | 40 | 41 | 41 | 41 | 41 | 40 | 39 | 38 | 38 |
| 1997 | 39 | 38 | 38 | 40 | 40 | 40 | 39 | 39 | 39 | 38 | 39 | 39 |
| 1998 | 39 | 39 | 40 | 40 | 41 | 41 | 42 | 42 | 42 | 41 | 41 | 40 |
| 1999 | 40 | 40 | 41 | 41 | 42 | 41 | 41 | 41 | 40 | 40 | 39 | 87 |
| 2000 | 87 | 87 | 88 | 88 | 90 | 90 | 88 | 88 | 88 | 88 | 88 | 88 |
| 2001 | 89 | 89 | 88 | 89 | 89 | 89 | 88 | 88 | 85 | 85 | 88 | 88 |
| 2002 | 88 | 88 | 89 | 88 | 89 | 88 | 88 | 89 | 88 | 88 | 88 | 88 |
| 2003 | 88 | 88 | 89 | 89 | 91 | 90 | 89 | 89 | 90 | 89 | 88 | 88 |
| 2004 | 88 | 89 | 89 | 67 | 67 | 69 | 69 | 69 | 69 | 69 | 69 | 68 |
| 2005 | 68 | 68 | 70 | 69 | 68 | 69 | 69 | 69 | 69 | 69 | 69 | 70 |
| 2006 | 68 | 69 | 70 | 71 | 71 | 71 | 71 | 71 | 66 | 65 | 66 | 64 |
| 2007 | 63 | 65 | 66 | 65 | 66 | 65 | 65 | 65 | 65 | 65 | 64 | 64 |
| 2008 | 64 | 65 | 65 | 66 | 65 | 65 | 66 | 67 | 67 | 66 | 52 | 53 |
| 2009 | 51 | 52 | 52 | 51 | 51 | 50 | 51 | 52 | 52 | 52 | 52 | 51 |
| 2010 | 41 | 46 | 35 | 46 | 46 | 47 | 48 | 48 | 48 | 48 | 48 | 47 |
| 2011 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 45 | 46 | 46 | 45 | 44 |
| 2012 | 44 | 46 | 47 | 47 | 47 | 49 | 49 | 49 | 47 | 47 | 45 | 45 |
| 2013 | 45 | 47 | 48 | 86 | 85 | 84 | 85 | 83 | 79 | 76 | 90 | 88 |
| 2014 | 88 | 106 | 135 | 136 | 136 | 131 | 133 | 135 | 137 | 138 | 136 | 153 |
| 2015 | 135 | 143 | 157 | 154 | 157 | 153 | 153 | 153 | 121 | 159 | 178 | 182 |
| 2016 | 182 | 188 | 180 | 184 | 186 | 176 | 144 | 146 | 145 | 145 | 147 | 148 |
| 2017 | 145 | 145 | 144 | 148 | 145 | 140 | 143 | 144 | 148 | 148 | 161 | 164 |
| 2018 | 164 | 163 | 162 | 160 | 159 | 160 | 157 | 156 | 162 | 162 | 155 | 173 |
| 2019 | 171 | 172 | 170 | 169 | 172 | 171 | 170 | 174 | 161 | 164 | 164 | 171 |
| 2020 | 359 | 362 | 372 | 370 | 327 | 302 | 307 | 312 | 315 | 312 | 341 | 346 |
| 2021 | 323 | 348 | 339 | 324 | 309 | 302 | 311 | 297 | 298 | 288 | 324 | 320 |
| 2022 | 325 | 309 | 288 | 314 | 306 | 329 | 317 | 313 | 338 | 343 | 342 | 337 |
| 2023 | 359 | 341 | 334 | 360 | 320 | 356 | 309 | 305 | 287 | 288 | 319 | 321 |
| 2024 | 356 | 331 | 329 | 316 | 320 | 315 | 313 | 327 | 321 | 314 | 321 | 338 |
| 2025 | 352 | 338 | 326 | 310 | 305 | 314 | 314 | 317 | 311 | 307 | 321 | 325 |
| - = 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 |