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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   
Rocky Mountain (PADD 4) Isobutane-Isobutylene Imports (Thousand Barrels per Day)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1984 3 4 3 3 2 2 2 2 2 5 4 5
  1985 4 4 3 2 1 2 3 3 3 2 3 3
  1986 4 4 2 3 3 2 2 2 3 1 3 3
  1987 3 4 3 3 2 2 2 2 2 3 3 4
  1988 3 3 2 2 3 1 2 2 2 1 2 3
  1989 1 0 0 0 0 0 0 0 0 0 1 1
  1990 0 1 1 1 1 1 1 1 1 1 2 1
  1991 0 0 0 1 2 1 0 0 0 1 1 0
  1992 1 0 0 0 0 0 0 1 1 1 0 0
  1993 0 0 0 0 1 0 1 1 0 0 1 0
  1994 0 1 0 0 0 0 0 0 0 0
  1995 0 0 0 0 0 0 0 1 2 0
  1996 0 0 1 0 0 2 1 1 1 1 0
  1997 0 0 1 1 1 1 0
  1998 0
  1999 0 0 0 0 1 1 1 1 0
  2000 0 0 0 0 0 0 0
  2001 1 1 0 0
  2002 0
  2004 0 1 0
  2007 0

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