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| U.S. Isobutane-Isobutylene Stock Change (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1981 | 659 | 170 | -261 | 453 | -143 | -131 | 101 | -303 | -249 | -102 | -4 | -371 |
| 1982 | -659 | 190 | -674 | -532 | 388 | -74 | 284 | 397 | 611 | 521 | 63 | -956 |
| 1983 | -1,094 | 51 | 339 | 975 | 487 | 1,705 | 278 | -659 | -218 | 908 | -371 | -820 |
| 1984 | -1,021 | 228 | -510 | -273 | 56 | 765 | -418 | -235 | 10 | 235 | -601 | 25 |
| 1985 | -414 | -952 | 252 | -365 | 235 | 39 | -264 | -245 | -423 | 462 | -238 | 239 |
| 1986 | -487 | 51 | 309 | 721 | 6 | 837 | 878 | 845 | -115 | -376 | 177 | -1,633 |
| 1987 | -703 | -925 | -149 | 213 | 1,269 | -1,236 | 34 | 678 | 1,786 | 642 | 73 | 291 |
| 1988 | -1,075 | -704 | -39 | 376 | -262 | 445 | 479 | 426 | 468 | -329 | -620 | -1,633 |
| 1989 | -460 | 312 | 767 | 222 | 450 | -583 | 166 | -7 | 278 | -57 | -261 | -788 |
| 1990 | -1,297 | 713 | 556 | 377 | 1,069 | 614 | 75 | 769 | 636 | -133 | -526 | -1,125 |
| 1991 | -718 | 6 | -89 | -454 | 206 | 656 | -419 | 968 | -131 | -65 | -781 | -942 |
| 1992 | 2,325 | -1,996 | 441 | 161 | 179 | -1,059 | -287 | 1,162 | 1,585 | 795 | 17 | -577 |
| 1993 | -194 | -160 | 390 | 638 | 1,887 | 366 | 401 | -719 | 225 | -938 | -1,707 | -733 |
| 1994 | -210 | 453 | 338 | -560 | -421 | -635 | 964 | 1,043 | -805 | -1,064 | -1,297 | |
| 1995 | -87 | -593 | 188 | 563 | 660 | 236 | 633 | 220 | -922 | -334 | -1,034 | -372 |
| 1996 | -652 | -281 | 398 | 555 | -112 | 907 | 945 | 491 | -518 | 363 | -1,399 | -204 |
| 1997 | -623 | -928 | -75 | 903 | 1,004 | 546 | 669 | 316 | 317 | -650 | -756 | -261 |
| 1998 | 336 | -192 | 603 | -49 | 176 | 223 | -336 | 449 | -101 | -936 | -599 | -462 |
| 1999 | -222 | 196 | -96 | 390 | 266 | 1 | 271 | -509 | -347 | 121 | -477 | -677 |
| 2000 | -555 | -16 | -154 | 191 | 389 | 1,091 | 978 | 75 | -550 | -821 | -697 | -265 |
| 2001 | -147 | 83 | 608 | -23 | 1,270 | -26 | -372 | 636 | 24 | -569 | -623 | -772 |
| 2002 | -139 | 1,005 | 291 | 711 | -20 | -389 | -141 | 254 | 59 | -64 | -379 | -583 |
| 2003 | -381 | -121 | -357 | 201 | 247 | 869 | -141 | 95 | 675 | 1,078 | -1,143 | -1,390 |
| 2004 | -380 | -321 | 1,219 | 161 | -291 | -441 | 687 | 505 | 458 | -1,897 | 213 | 22 |
| 2005 | 272 | 345 | -231 | 707 | 237 | -707 | 224 | 777 | -656 | 587 | -188 | -887 |
| 2006 | 50 | 105 | 873 | 601 | 1,220 | -704 | -979 | -75 | -203 | 97 | 196 | -1,401 |
| 2007 | -11 | 607 | 209 | 788 | 697 | -28 | 66 | -334 | 545 | 557 | -1,313 | -1,301 |
| 2008 | 76 | 96 | 711 | 418 | 359 | -61 | -153 | 629 | 166 | -939 | -1,028 | -24 |
| 2009 | 248 | 632 | -595 | -224 | 73 | -241 | -69 | 120 | -199 | 519 | -472 | -8 |
| 2010 | 97 | 285 | -264 | -161 | 432 | 276 | 214 | -45 | 834 | 485 | -1,150 | -835 |
| 2011 | -272 | -90 | 453 | 292 | 464 | -261 | -614 | -691 | -192 | 24 | 464 | 496 |
| 2012 | 819 | -28 | 395 | 422 | -217 | -525 | 278 | -352 | 402 | 477 | 339 | -359 |
| 2013 | -217 | 290 | ||||||||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 4/29/2013 |
| Next Release Date: Last Week of May 2013 |
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