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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 Net Receipts (Thousand Barrels per Day)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1989 -4 -5 -6 -5 -6 -5 -7 -5 -6 -6 -5 -5
  1990 -5 -5 -5 -7 -7 -6 -5 -6 -5 -7 -4 -4
  1991 -5 -7 -6 -5 -6 -7 -7 -7 -7 -5 -7 -5
  1992 -6 -6 -6 -7 -7 -6 -7 -7 -7 -7 -6 -5
  1993 -5 -6 -7 -8 -8 -8 -7 -7 -6 -6 -6 -4
  1994 -5 -6 -6 -5 -8 -8 -8 -9 -9 -7 -8 -6
  1995 -6 -7 -8 -9 -9 -9 -8 -9 -9 -9 -8 -8
  1996 -8 -7 -9 -11 -9 -10 -8 -12 -9 -9 -8 -8
  1997 -7 -7 -9 -10 -9 -11 -9 -9 -9 -8 -7 -8
  1998 -8 -8 -10 -11 -10 -10 -11 -10 -10 -9 -9 -9
  1999 -8 -8 -10 -10 -10 -12 -9 -9 -12 -9 -8 -8
  2000 -7 -8 -10 -10 -13 -12 -11 -11 -11 -12 -11 -9
  2001 -10 -11 -9 -11 -11 -12 -11 -11 -10 -9 -9 -10
  2002 -10 -10 -11 -12 -11 -12 -11 -12 -12 -10 -11 -11
  2003 -10 -8 -10 -10 -12 -13 -12 -11 -11 -10 -10 -10
  2004 -10 -10 -11 -11 -11 -13 -12 -13 -12 -11 -10 -10
  2005 -10 -11 -11 -11 -12 -11 -11 -12 -8 -11 -10 -8
  2006 -11 -9 -11 -13 -12 -12 -12 -12 -12 -12 -11 -10
  2007 -10 -11 -12 -13 -14 -13 -11 -13 -12 -12 -14 -12
  2008 -11 -13 -16 -15

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