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Note: These data are available in spreadsheet format by clicking the ''Download Series History'' link on the previous page (with drop-down menu bar at top).
 View History:    Monthly     Annual   
Midwest (PADD 2) Refinery and Blender Net Inputs of Isobutane/Isobutylene (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1981 1,042 1,563 1,967 1,457 1,882 1,253 1,249 1,496 1,317 1,598 1,481 1,691
  1982 1,397 1,410 1,524 1,495 1,308 1,478 1,509 1,339 1,327 1,136 1,248 1,486
  1983 1,413 1,074 1,063 1,065 1,151 627 1,256 1,248 1,195 1,242 1,353 1,322
  1984 1,401 1,337 1,357 1,156 1,517 1,550 1,439 1,416 1,247 1,341 1,414 1,504
  1985 1,271 1,267 1,369 1,163 1,202 1,483 1,410 1,433 1,324 1,467 1,532 1,428
  1986 1,367 1,064 1,256 1,007 1,280 1,410 1,408 1,533 1,382 1,311 1,386 1,468
  1987 1,515 1,240 1,424 1,501 1,546 1,443 1,475 1,439 1,502 1,266 1,365 1,297
  1988 1,215 1,283 1,419 1,397 1,557 1,559 1,507 1,451 1,210 1,070 1,479 1,502
  1989 1,439 1,362 1,309 1,283 1,364 1,385 1,345 1,380 1,383 1,220 1,268 1,431
  1990 1,435 1,217 1,364 1,185 1,252 1,292 1,419 1,556 1,389 1,398 1,338 1,456
  1991 1,231 1,315 1,355 1,724 1,849 1,560 1,492 1,615 1,348 1,065 1,270 1,398
  1992 1,452 1,287 1,503 1,222 1,482 1,492 1,586 1,324 1,170 1,128 1,363 1,498
  1993 1,377 1,179 1,373 1,204 1,472 1,393 1,259 1,421 1,323 1,587 1,517 1,462
  1994 1,225 1,073 1,151 1,120 1,437 1,341 1,354 1,296 944 1,011 1,359 1,454
  1995 1,367 1,057 1,283 1,029 1,158 996 1,205 1,122 1,209 1,350 1,372 1,179
  1996 1,333 1,019 1,057 1,030 1,015 1,099 1,018 1,093 1,132 920 1,048 900
  1997 889 745 948 1,097 908 900 936 787 872 922 935 846
  1998 748 702 744 811 1,021 914 1,124 1,031 647 983 895 835
  1999 843 898 934 973 1,004 955 890 904 870 715 545 774
  2000 736 567 787 877 937 904 988 999 938 757 651 611
  2001 680 650 854 1,001 1,162 935 893 917 1,013 1,008 820 1,018
  2002 1,087 957 1,110 977 996 981 1,109 1,087 1,118 1,059 1,148 974
  2003 908 840 740 922 931 903 956 1,027 720 618 742 743
  2004 1,075 884 913 993 1,114 1,192 1,236 1,238 1,281 1,181 1,115 1,078
  2005 950 877 837 1,093 1,194 1,327 1,302 1,388 1,311 1,434 1,378 1,136
  2006 1,253 1,109 1,269 1,453 1,450 1,482 1,632 1,598 1,424 1,121 987 1,350
  2007 1,271 1,010 1,134 1,347 1,558 1,306 1,385 1,430 1,385 1,093 1,265 1,383
  2008 1,320 1,167 1,199 1,355

Updated on 6/26/2008
Source: U.S. Energy Information Administration
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