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| West Coast (PADD 5) Field Production of Isobutane (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1981 | 16 | 15 | 17 | 14 | 17 | 18 | 20 | 24 | 21 | 23 | 18 | 18 |
| 1982 | 21 | 21 | 24 | 23 | 23 | 23 | 23 | 21 | 21 | 20 | 19 | 18 |
| 1983 | 10 | 9 | 12 | 11 | 12 | 11 | 8 | 7 | 11 | 10 | 11 | 9 |
| 1984 | 61 | 59 | 60 | 58 | 66 | 64 | 59 | 70 | 71 | 69 | 67 | 66 |
| 1985 | 62 | 59 | 75 | 77 | 93 | 87 | 80 | 83 | 88 | 92 | 86 | 84 |
| 1986 | 85 | 76 | 87 | 85 | 89 | 85 | 82 | 86 | 84 | 92 | 90 | 104 |
| 1987 | 90 | 122 | 231 | 148 | 235 | 247 | 262 | 265 | 269 | 250 | 285 | 294 |
| 1988 | 280 | 246 | 284 | 257 | 255 | 250 | 240 | 244 | 243 | 233 | 235 | 230 |
| 1989 | 228 | 200 | 216 | 186 | 223 | 213 | 203 | 210 | 175 | 204 | 117 | 131 |
| 1990 | 164 | 188 | 208 | 146 | 209 | 162 | 177 | 174 | 168 | 249 | 217 | 198 |
| 1991 | 331 | 382 | 359 | 335 | 427 | 347 | 374 | 380 | 348 | 380 | 387 | 368 |
| 1992 | 334 | 366 | 410 | 398 | 428 | 405 | 394 | 428 | 436 | 460 | 403 | 415 |
| 1993 | 426 | 408 | 473 | 495 | 463 | 431 | 385 | 444 | 421 | 456 | 419 | 446 |
| 1994 | 412 | 406 | 447 | 364 | 441 | 436 | 401 | 422 | 420 | 386 | 382 | 405 |
| 1995 | 399 | 380 | 415 | 404 | 444 | 404 | 408 | 419 | 408 | 492 | 473 | 459 |
| 1996 | 436 | 423 | 487 | 396 | 292 | 404 | 395 | 516 | 588 | 650 | 636 | 517 |
| 1997 | 586 | 610 | 635 | 627 | 694 | 666 | 622 | 581 | 645 | 580 | 500 | 460 |
| 1998 | 313 | 547 | 559 | 596 | 521 | 605 | 574 | 480 | 563 | 598 | 477 | 354 |
| 1999 | 388 | 316 | 549 | 540 | 622 | 554 | 512 | 378 | 443 | 483 | 362 | 323 |
| 2000 | 332 | 350 | 333 | 413 | 462 | 523 | 458 | 385 | 448 | 376 | 362 | 355 |
| 2001 | 398 | 406 | 462 | 415 | 488 | 317 | 427 | 443 | 464 | 488 | 353 | 320 |
| 2002 | 331 | 429 | 385 | 498 | 459 | 403 | 440 | 412 | 375 | 427 | 356 | 302 |
| 2003 | 382 | 351 | 386 | 433 | 450 | 419 | 405 | 438 | 470 | 443 | 420 | 380 |
| 2004 | 358 | 317 | 470 | 620 | 647 | 529 | 429 | 579 | 520 | 535 | 474 | 428 |
| 2005 | 439 | 456 | 526 | 590 | 623 | 543 | 498 | 517 | 500 | 498 | 413 | 446 |
| 2006 | 456 | 389 | 420 | 562 | 587 | 496 | 409 | 467 | 495 | 491 | 535 | 470 |
| 2007 | 445 | 476 | 433 | 549 | 585 | 549 | 537 | 539 | 505 | 545 | 515 | 488 |
| 2008 | 506 | 388 | 524 | 428 | 615 | 516 | 536 | 510 | 509 | 608 | 546 | 544 |
| 2009 | 517 | 476 | 479 | 509 | 563 | 542 | 545 | 446 | 485 | 598 | 461 | 475 |
| 2010 | 457 | 443 | 271 | 257 | 375 | 410 | 369 | 475 | 436 | 479 | 292 | 348 |
| 2011 | 252 | 319 | 480 | 494 | 492 | 535 | 450 | 483 | 525 | 512 | 513 | 399 |
| 2012 | 407 | 278 | 526 | 535 | 533 | 530 | 472 | 446 | 544 | 455 | 323 | 344 |
| 2013 | 334 | 407 | 481 | 330 | 435 | 386 | 480 | 524 | 443 | 150 | 347 | 387 |
| 2014 | 352 | 327 | 339 | 344 | 276 | 403 | 348 | 314 | 433 | 392 | 355 | 312 |
| 2015 | 389 | 249 | 233 | 367 | 374 | 427 | 419 | 379 | 386 | 309 | 285 | 306 |
| 2016 | 419 | 331 | 311 | 360 | 297 | 381 | 305 | 320 | 391 | 331 | 357 | 377 |
| 2017 | 332 | 366 | 359 | 468 | 576 | 375 | 444 | 439 | 383 | 275 | 339 | 337 |
| 2018 | 326 | 328 | 330 | 325 | 428 | 475 | 397 | 492 | 408 | 332 | 475 | 419 |
| 2019 | 342 | 257 | 323 | 379 | 504 | 467 | 457 | 286 | 264 | 332 | 244 | 275 |
| 2020 | 293 | 411 | 435 | 256 | 240 | 297 | 222 | 174 | 185 | 208 | 217 | 268 |
| 2021 | 284 | 263 | 300 | 270 | 211 | 245 | 148 | 270 | 246 | 242 | 310 | 268 |
| 2022 | 248 | 228 | 347 | 386 | 345 | 345 | 170 | 184 | 198 | 185 | 195 | 212 |
| 2023 | 258 | 182 | 201 | 213 | 207 | 176 | 146 | 131 | 165 | 186 | 166 | 193 |
| 2024 | 191 | 179 | 190 | 175 | 171 | 151 | 154 | 139 | 151 | 168 | 174 | 182 |
| 2025 | 182 | 164 | 165 | 167 | 172 | 151 | 126 | 138 | 149 | 159 | 157 | |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 2/6/2026 |
| Next Release Date: 2/27/2026 |