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U.S. Refinery and Blender Net Inputs of Isobutane/Isobutylene (Thousand Barrels)
U.S. Refinery and Blender Net Inputs of Isobutane/Isobutylene (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1981 2,940 3,127 3,676 3,294 3,869 3,772 3,606 3,940 3,789 3,681 3,503 3,267
  1982 4,007 2,696 4,060 3,634 3,120 3,491 3,052 3,118 2,863 2,898 3,119 4,205
  1983 4,206 2,708 2,738 2,242 2,530 1,275 2,887 3,489 3,113 2,248 3,607 3,877
  1984 3,570 3,460 3,661 3,340 3,692 3,499 3,823 3,741 3,779 3,724 3,608 3,354
  1985 3,433 3,334 3,650 3,833 4,123 4,482 4,587 4,587 4,475 4,311 4,055 3,894
  1986 3,852 3,234 3,398 3,661 4,352 4,010 3,700 4,356 4,286 4,311 4,150 4,448
  1987 4,388 3,413 3,726 4,129 4,176 4,214 4,610 4,618 4,032 3,894 3,742 3,912
  1988 3,964 4,096 4,191 4,353 4,834 4,425 4,819 4,902 4,100 4,381 4,787 4,728
  1989 4,384 3,649 4,092 4,259 4,443 5,243 4,917 5,057 4,916 4,603 4,743 4,847
  1990 5,029 4,291 4,040 4,234 4,810 4,733 4,915 5,304 4,812 4,723 4,877 4,707
  1991 4,090 3,853 4,441 4,878 5,151 5,001 5,396 5,234 4,629 4,618 4,457 4,847
  1992 4,293 4,406 5,056 4,857 5,449 5,550 5,674 5,108 4,692 4,715 4,521 5,209
  1993 4,679 4,380 4,997 4,923 5,367 5,299 5,537 5,767 5,089 5,297 5,243 5,302
  1994 4,973 4,272 4,134 4,589 5,353 5,258 5,261 4,853 4,107 4,310 4,362 4,845
  1995 4,162 3,435 4,477 4,370 4,458 4,207 4,896 4,430 4,699 4,944 4,345 4,231
  1996 4,792 3,854 4,199 4,493 4,221 4,169 4,184 4,092 4,079 3,543 4,044 3,635
  1997 3,709 3,310 3,865 4,175 4,087 4,009 4,095 3,715 3,577 3,701 3,549 3,555
  1998 3,272 3,313 3,576 3,679 3,931 3,829 3,786 3,853 3,418 3,943 3,685 3,220
  1999 3,200 2,707 3,729 4,100 3,954 3,579 3,616 3,807 3,486 3,322 3,067 3,359
  2000 3,219 2,792 3,415 3,104 3,410 3,347 3,559 3,524 3,784 3,293 3,148 2,719
  2001 2,685 2,663 3,409 4,134 4,596 3,998 4,111 3,798 3,690 3,413 3,515 3,532
  2002 3,673 3,152 3,681 3,768 3,919 3,873 4,165 4,038 3,713 3,779 3,692 3,679
  2003 3,360 3,096 3,377 3,481 3,849 3,656 3,963 4,122 3,656 3,327 3,328 3,418
  2004 3,651 3,518 3,641 4,265 4,637 4,263 4,467 4,435 4,231 4,220 3,852 3,602
  2005 3,467 3,535 3,649 3,974 4,383 4,658 4,760 4,740 4,093 3,987 3,988 3,796
  2006 4,497 3,954 4,562 5,466 6,347 6,146 6,030 6,566 5,909 5,571 5,157 6,207
  2007 5,413 4,732 5,847 6,123 6,654 6,022 6,603 6,366 6,147 5,615 6,099 5,867
  2008 5,664 5,230 6,173 6,123 6,539 6,414 6,346

- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 9/30/2008
Next Release Date: Last Week of October 2008

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