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U.S. Field Production of Isobutane (Thousand Barrels)
U.S. Field Production of Isobutane (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 5,609 5,187 6,154 5,228 5,532 5,108 5,328 5,284 3,905 5,328 5,417 5,183
  2009 5,639 5,071 5,284 5,426 6,145 6,090 6,377 5,988 5,663 6,047 5,641 5,333
  2010 5,091 4,813 5,563 5,393 6,170 6,244 6,151 6,093 5,618 5,925 5,343 5,843
  2011 5,579 4,974 6,589 6,440 6,704 6,260 6,388 6,708 6,614 6,979 6,881 6,867
  2012 6,302 5,806 6,183 6,958 6,909 6,701 7,429 7,298 7,051 7,243 7,355 7,218
  2013 7,191 6,075 7,320 7,532 7,660 7,304 8,169 8,335 7,687 7,181 7,677 7,635
  2014 6,876 6,453 7,863 8,101 8,593 8,663 8,858 8,901 8,015 8,578 8,332 8,668
  2015 8,465 7,312 8,717 8,556 9,461 9,334 9,821 9,577 9,530 10,040 9,325 9,739
  2016 10,630 9,629 10,499 10,547 11,003 10,764 10,927 11,074 10,534 9,638 9,651 10,753
  2017 10,026 9,053 9,832 10,566 11,592 11,211 11,730 11,049 10,665 10,603 10,409 11,180
  2018 11,166 10,083 11,603


- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 5/31/2018
Next Release Date: 6/1/2018

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