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U.S. Isobutane-Isobutylene Field Production (Thousand Barrels)
U.S. Isobutane-Isobutylene Field Production (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1981 3,698 3,198 3,482 3,672 3,721 3,648 3,703 3,651 3,537 3,581 3,497 3,158
  1982 3,350 2,882 3,386 3,106 3,507 3,415 3,285 3,511 3,483 3,418 3,181 3,253
  1983 3,112 2,761 3,060 3,217 2,960 2,996 3,094 2,856 2,933 3,108 3,228 3,065
  1984 2,874 2,855 3,019 3,022 3,104 3,002 3,071 3,171 2,998 3,088 2,945 3,119
  1985 3,297 3,059 3,874 4,025 4,248 4,095 4,258 3,397 3,781 4,197 4,303 3,936
  1986 3,598 3,519 3,790 3,779 4,135 3,777 4,333 4,036 3,842 4,079 4,182 3,552
  1987 3,774 3,357 3,829 4,378 4,472 4,471 4,608 4,591 4,548 4,710 4,234 4,430
  1988 4,539 4,116 4,514 4,318 4,500 4,365 4,569 4,558 4,409 4,395 4,239 4,025
  1989 4,364 4,333 4,875 4,819 4,986 4,525 4,482 4,719 4,232 4,697 4,513 3,928
  1990 4,042 4,550 4,894 4,624 4,956 4,814 5,040 4,948 4,667 4,833 3,940 3,933
  1991 4,335 4,452 4,722 4,886 5,628 5,259 5,572 5,638 5,417 5,596 4,815 5,191
  1992 5,439 5,211 5,642 5,136 5,678 5,437 5,724 5,956 6,309 6,363 6,217 5,948
  1993 5,301 4,850 6,013 6,384 6,941 6,665 6,061 5,955 5,821 5,527 5,095 5,444
  1994 6,044 5,727 5,991 5,591 5,958 6,061 6,583 7,029 6,432 5,142 5,459 5,299
  1995 5,848 4,652 5,122 6,382 6,665 5,851 5,827 5,274 5,659 5,705 5,418 5,152
  1996 5,578 5,079 6,054 6,256 6,474 6,481 6,325 6,241 5,645 5,696 5,509 4,869
  1997 5,002 5,054 6,072 6,498 5,888 6,042 5,970 5,873 5,730 6,002 5,389 6,141
  1998 5,503 5,096 5,481 5,652 5,387 5,805 5,584 5,658 5,376 5,793 5,556 5,288
  1999 5,276 5,331 5,785 5,795 5,959 5,802 5,987 5,783 5,624 5,871 5,458 5,607
  2000 5,618 5,620 5,796 5,534 6,009 6,240 6,282 5,983 5,672 5,750 5,425 5,020
  2001 4,588 5,033 5,903 5,985 6,883 6,274 6,384 6,502 6,208 6,494 6,092 6,090
  2002 5,810 5,443 6,017 5,971 6,339 5,932 6,065 6,903 5,842 6,525 6,593 6,019
  2003 5,862 5,375 5,884 6,252 5,748 4,944 5,598 5,783 5,737 5,471 5,099 5,221
  2004 5,053 4,952 5,633 5,459 5,443 4,966 5,451 5,231 4,757 4,883 4,955 4,705
  2005 4,613 4,272 4,715 4,813 5,721 5,368 6,300 6,052 4,694 5,283 4,806 4,865
  2006 4,779 4,545 5,484 5,013 5,331 5,001 5,043 5,172 4,990 4,819 4,819 4,361
  2007 4,969 5,160 5,439 5,604 5,679 5,169 5,444 5,369 5,750 5,305 5,038 5,355
  2008 5,594 5,140 6,104 5,222 5,584 5,058 5,320

- = 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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