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| West Coast (PADD 5) Isobutane-Isobutylene Stocks at Refineries (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1993 | 230 | 236 | 344 | 335 | 395 | 435 | 387 | 366 | 303 | 343 | 329 | 389 |
| 1994 | 305 | 333 | 325 | 316 | 305 | 351 | 444 | 483 | 364 | 308 | 302 | 297 |
| 1995 | 312 | 314 | 383 | 292 | 254 | 262 | 339 | 376 | 438 | 385 | 415 | 300 |
| 1996 | 321 | 433 | 367 | 525 | 312 | 517 | 403 | 434 | 540 | 584 | 442 | 344 |
| 1997 | 339 | 441 | 401 | 410 | 432 | 499 | 526 | 433 | 493 | 488 | 437 | 351 |
| 1998 | 401 | 535 | 481 | 434 | 405 | 511 | 547 | 395 | 361 | 463 | 292 | 322 |
| 1999 | 300 | 430 | 405 | 431 | 343 | 338 | 489 | 365 | 397 | 360 | 362 | 274 |
| 2000 | 199 | 307 | 346 | 426 | 364 | 397 | 586 | 463 | 367 | 387 | 409 | 455 |
| 2001 | 372 | 280 | 418 | 439 | 507 | 424 | 365 | 291 | 351 | 399 | 390 | 334 |
| 2002 | 276 | 283 | 393 | 416 | 413 | 362 | 271 | 315 | 258 | 383 | 296 | 242 |
| 2003 | 268 | 345 | 431 | 525 | 389 | 468 | 370 | 426 | 502 | 529 | 552 | 451 |
| 2004 | 457 | 411 | 348 | 378 | 438 | 436 | 410 | 415 | 569 | 387 | 460 | 543 |
| 2005 | 569 | 614 | 524 | 573 | 400 | 465 | 425 | 494 | 554 | 508 | 445 | 295 |
| 2006 | 436 | 553 | 562 | 555 | 647 | 628 | 582 | 551 | 478 | 338 | 381 | 439 |
| 2007 | 320 | 493 | 526 | 631 | 686 | 596 | 572 | 569 | 526 | 424 | 491 | 436 |
| 2008 | 684 | 565 | 694 | 542 | 523 | 494 | 423 | 498 | 427 | 431 | 321 | 395 |
| 2009 | 441 | 673 | 550 | 535 | 573 | 603 | 508 | 538 | 495 | 492 | 413 | 434 |
| 2010 | 536 | 517 | 488 | 485 | 501 | 524 | 521 | 457 | 440 | 473 | 467 | 447 |
| 2011 | 457 | 597 | 509 | 727 | 575 | 512 | 460 | 526 | 542 | 319 | 488 | 481 |
| 2012 | 494 | 502 | 591 | 592 | 553 | 548 | 579 | 513 | 578 | 618 | 474 | 456 |
| 2013 | 558 | 719 | 583 | 522 | 506 | 543 | 431 | 376 | 501 | 516 | 563 | 385 |
| 2014 | 451 | 652 | 668 | 641 | 585 | 574 | 659 | 538 | 532 | 512 | 466 | 381 |
| 2015 | 494 | 516 | 599 | 580 | 506 | 442 | 444 | 426 | 514 | 446 | 479 | 433 |
| 2016 | 424 | 507 | 529 | 490 | 598 | 551 | 655 | 547 | 558 | 412 | 426 | 445 |
| 2017 | 487 | 494 | 413 | 461 | 448 | 459 | 428 | 522 | 489 | 578 | 521 | 389 |
| 2018 | 437 | 519 | 682 | 561 | 521 | 513 | 472 | 410 | 512 | 345 | 377 | 378 |
| 2019 | 335 | 390 | 403 | 470 | 438 | 469 | 542 | 505 | 440 | 389 | 441 | 376 |
| 2020 | 384 | 374 | 479 | 478 | 448 | 495 | 462 | 454 | 381 | 376 | 371 | 339 |
| 2021 | 355 | 334 | 358 | 434 | 369 | 373 | 342 | 387 | 335 | 295 | 272 | 292 |
| 2022 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2023 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2024 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | ||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 12/31/2024 |
| Next Release Date: 1/31/2025 |