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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   
Gulf Coast (PADD 3) Refinery and Blender Net Inputs of Isobutane/Isobutylene (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1981 1,638 1,261 1,277 1,513 1,627 2,026 1,807 1,904 1,923 1,534 1,532 1,140
  1982 2,059 853 2,030 1,611 1,245 1,350 936 1,237 923 1,290 1,433 2,315
  1983 2,310 1,348 1,408 889 1,000 319 1,393 1,993 1,710 759 2,008 2,320
  1984 1,976 1,829 1,916 1,742 1,863 1,591 1,970 1,890 2,084 2,099 1,892 1,515
  1985 1,814 1,908 2,109 2,281 2,526 2,534 2,702 2,596 2,599 2,454 2,246 2,186
  1986 2,162 1,872 1,810 2,200 2,500 2,101 1,807 2,331 2,435 2,570 2,552 2,645
  1987 2,581 1,782 1,953 2,205 2,218 2,397 2,749 2,721 2,136 2,292 2,030 2,326
  1988 2,302 2,332 2,299 2,469 2,601 2,262 2,681 2,886 2,370 2,831 2,845 2,732
  1989 2,423 1,919 2,310 2,536 2,689 3,304 3,023 3,196 3,028 2,818 3,019 2,930
  1990 3,062 2,604 2,304 2,685 3,139 3,052 2,957 3,219 2,882 2,695 2,801 2,683
  1991 2,291 2,045 2,563 2,544 2,582 2,772 3,163 2,861 2,554 2,724 2,505 2,778
  1992 2,191 2,377 2,826 2,946 3,276 3,393 3,465 2,986 2,850 2,707 2,408 2,775
  1993 2,544 2,532 2,756 2,855 3,178 3,082 3,436 3,378 2,990 2,847 2,967 3,039
  1994 2,938 2,414 2,251 2,737 3,083 3,070 3,034 2,800 2,394 2,390 2,307 2,513
  1995 2,149 1,808 2,481 2,718 2,523 2,509 2,907 2,573 2,677 2,694 2,269 2,333
  1996 2,773 2,102 2,363 2,769 2,520 2,363 2,426 2,384 2,152 1,842 2,306 2,108
  1997 2,166 2,008 2,275 2,251 2,290 2,288 2,380 2,146 1,956 2,133 2,036 2,063
  1998 1,960 2,170 2,261 2,183 2,310 2,202 2,040 2,261 2,081 2,209 2,158 1,728
  1999 1,642 1,305 2,190 2,492 2,309 1,904 2,117 2,270 1,987 1,957 1,898 2,082
  2000 1,905 1,583 2,033 1,766 1,934 1,815 1,957 1,905 2,158 1,865 2,022 1,655
  2001 1,353 1,432 1,887 2,396 2,719 2,473 2,530 2,237 2,088 1,772 2,033 2,021
  2002 2,017 1,626 1,990 2,158 2,209 2,330 2,397 2,360 2,106 2,185 2,023 2,189
  2003 1,812 1,752 2,087 1,963 2,344 2,224 2,379 2,492 2,325 2,095 2,009 2,095
  2004 2,087 2,149 2,107 2,515 2,734 2,490 2,525 2,537 2,347 2,452 2,062 1,894
  2005 1,915 2,012 2,136 2,195 2,478 2,748 2,874 2,688 2,144 1,909 1,945 2,061
  2006 2,057 1,660 2,054 2,958 3,338 3,426 3,271 3,644 3,452 3,260 2,976 3,506
  2007 2,887 2,527 3,140 3,170 3,498 3,268 3,438 3,496 3,464 3,150 3,513 3,310
  2008 3,168 2,878 3,598 3,671

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