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| Midwest (PADD 2) Isobutane-Isobutylene Stocks at Refineries (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1993 | 465 | 490 | 527 | 537 | 492 | 505 | 479 | 543 | 525 | 486 | 451 | 522 |
| 1994 | 614 | 550 | 493 | 488 | 435 | 461 | 509 | 711 | 631 | 546 | 545 | 607 |
| 1995 | 528 | 488 | 589 | 499 | 524 | 625 | 641 | 624 | 469 | 573 | 585 | 570 |
| 1996 | 555 | 575 | 652 | 553 | 581 | 666 | 664 | 543 | 538 | 551 | 588 | 542 |
| 1997 | 510 | 421 | 429 | 614 | 624 | 593 | 588 | 601 | 598 | 552 | 482 | 518 |
| 1998 | 473 | 520 | 517 | 549 | 464 | 415 | 419 | 460 | 466 | 499 | 549 | 484 |
| 1999 | 456 | 435 | 347 | 411 | 440 | 443 | 460 | 444 | 351 | 420 | 460 | 497 |
| 2000 | 467 | 471 | 454 | 376 | 464 | 458 | 491 | 500 | 346 | 356 | 435 | 415 |
| 2001 | 439 | 402 | 436 | 413 | 468 | 466 | 504 | 419 | 451 | 378 | 389 | 366 |
| 2002 | 346 | 458 | 423 | 507 | 495 | 511 | 466 | 403 | 627 | 491 | 493 | 412 |
| 2003 | 499 | 518 | 560 | 439 | 425 | 510 | 534 | 499 | 562 | 479 | 492 | 486 |
| 2004 | 474 | 481 | 456 | 623 | 514 | 541 | 555 | 499 | 521 | 472 | 486 | 529 |
| 2005 | 488 | 510 | 656 | 571 | 369 | 362 | 373 | 379 | 307 | 343 | 357 | 394 |
| 2006 | 415 | 472 | 526 | 515 | 431 | 319 | 328 | 467 | 493 | 514 | 526 | 595 |
| 2007 | 688 | 708 | 656 | 618 | 624 | 730 | 759 | 829 | 863 | 900 | 754 | 767 |
| 2008 | 652 | 536 | 520 | 502 | 522 | 515 | 555 | 502 | 464 | 438 | 531 | 473 |
| 2009 | 493 | 493 | 561 | 589 | 477 | 440 | 466 | 396 | 442 | 417 | 423 | 438 |
| 2010 | 548 | 588 | 614 | 438 | 467 | 465 | 478 | 459 | 503 | 540 | 658 | 572 |
| 2011 | 554 | 520 | 532 | 497 | 525 | 481 | 464 | 429 | 407 | 398 | 499 | 548 |
| 2012 | 533 | 584 | 553 | 507 | 523 | 474 | 395 | 429 | 365 | 509 | 480 | 466 |
| 2013 | 494 | 506 | 436 | 392 | 457 | 411 | 380 | 418 | 416 | 424 | 471 | 454 |
| 2014 | 477 | 450 | 506 | 532 | 967 | 1,053 | 636 | 574 | 581 | 611 | 544 | 545 |
| 2015 | 532 | 554 | 569 | 631 | 594 | 827 | 897 | 938 | 854 | 702 | 803 | 722 |
| 2016 | 765 | 783 | 709 | 711 | 665 | 669 | 517 | 494 | 496 | 588 | 612 | 534 |
| 2017 | 486 | 520 | 482 | 489 | 384 | 404 | 427 | 414 | 494 | 477 | 463 | 485 |
| 2018 | 509 | 466 | 378 | 379 | 398 | 417 | 443 | 468 | 492 | 371 | 434 | 472 |
| 2019 | 567 | 533 | 421 | 472 | 600 | 682 | 648 | 659 | 637 | 588 | 637 | 597 |
| 2020 | 601 | 574 | 664 | 652 | 480 | 476 | 489 | 428 | 502 | 502 | 467 | 445 |
| 2021 | 479 | 441 | 469 | 465 | 483 | 436 | 424 | 423 | 488 | 472 | 476 | 526 |
| 2022 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2023 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2024 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2025 | -- | -- | ||||||||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 4/30/2025 |
| Next Release Date: 5/30/2025 |