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| Rocky Mountain (PADD 4) Normal Butane-Butylene Stocks at Refineries (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1993 | 128 | 162 | 210 | 198 | 230 | 270 | 250 | 325 | 288 | 233 | 188 | 216 |
| 1994 | 248 | 233 | 195 | 192 | 179 | 210 | 233 | 288 | 253 | 280 | 258 | 229 |
| 1995 | 221 | 134 | 211 | 214 | 204 | 212 | 223 | 252 | 311 | 290 | 190 | 180 |
| 1996 | 192 | 210 | 240 | 209 | 217 | 204 | 234 | 229 | 273 | 254 | 180 | 156 |
| 1997 | 142 | 183 | 207 | 177 | 193 | 195 | 201 | 265 | 232 | 235 | 186 | 180 |
| 1998 | 199 | 205 | 188 | 200 | 163 | 146 | 177 | 245 | 198 | 174 | 228 | 174 |
| 1999 | 174 | 194 | 207 | 215 | 203 | 198 | 232 | 216 | 192 | 216 | 157 | 114 |
| 2000 | 152 | 144 | 119 | 237 | 231 | 210 | 216 | 299 | 246 | 281 | 175 | 156 |
| 2001 | 181 | 216 | 227 | 259 | 280 | 261 | 250 | 307 | 256 | 203 | 191 | 205 |
| 2002 | 204 | 199 | 148 | 229 | 194 | 209 | 198 | 223 | 209 | 175 | 176 | 150 |
| 2003 | 143 | 184 | 190 | 217 | 242 | 146 | 193 | 192 | 149 | 140 | 163 | 193 |
| 2004 | 158 | 166 | 187 | 177 | 170 | 151 | 145 | 181 | 184 | 151 | 158 | 101 |
| 2005 | 188 | 147 | 200 | 217 | 225 | 215 | 217 | 205 | 150 | 193 | 155 | 211 |
| 2006 | 173 | 155 | 227 | 227 | 247 | 279 | 260 | 271 | 252 | 237 | 191 | 180 |
| 2007 | 172 | 211 | 242 | 303 | 352 | 335 | 352 | 348 | 329 | 254 | 256 | 213 |
| 2008 | 180 | 162 | 154 | 195 | 201 | 223 | 230 | 253 | 239 | 220 | 218 | 175 |
| 2009 | 150 | 162 | 156 | 263 | 330 | 327 | 300 | 283 | 242 | 297 | 253 | 282 |
| 2010 | 226 | 239 | 271 | 300 | 292 | 284 | 254 | 286 | 260 | 208 | 191 | 221 |
| 2011 | 192 | 173 | 207 | 248 | 272 | 242 | 220 | 272 | 251 | 242 | 175 | 170 |
| 2012 | 139 | 154 | 129 | 136 | 178 | 190 | 190 | 276 | 222 | 256 | 262 | 267 |
| 2013 | 182 | 154 | 173 | 232 | 199 | 246 | 339 | 307 | 252 | 279 | 224 | 212 |
| 2014 | 150 | 201 | 247 | 198 | 154 | 126 | 191 | 269 | 309 | 285 | 221 | 226 |
| 2015 | 219 | 199 | 218 | 229 | 213 | 224 | 206 | 225 | 254 | 292 | 282 | 220 |
| 2016 | 205 | 238 | 233 | 184 | 193 | 230 | 195 | 217 | 247 | 242 | 285 | 247 |
| 2017 | 206 | 219 | 217 | 247 | 245 | 236 | 256 | 240 | 244 | 301 | 286 | 273 |
| 2018 | 292 | 292 | 283 | 267 | 329 | 269 | 244 | 261 | 269 | 358 | 328 | 255 |
| 2019 | 226 | 273 | 230 | 249 | 290 | 323 | 336 | 347 | 316 | 341 | 316 | 307 |
| 2020 | 307 | 368 | 303 | 301 | 335 | 298 | 330 | 400 | 442 | 391 | 381 | 358 |
| 2021 | 254 | 231 | 236 | 259 | 301 | 318 | 301 | 340 | 378 | 355 | 259 | 239 |
| 2022 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2023 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2024 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2025 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2026 | -- | |||||||||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 3/31/2026 |
| Next Release Date: 4/30/2026 |