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Rocky Mountain (PADD 4) Product Supplied of Isobutane-Isobutylene(Thousand Barrels per Day)
Rocky Mountain (PADD 4) Product Supplied of Isobutane-Isobutylene(Thousand Barrels per Day)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1989 1 1 1 1 -1 -5 -6 -3 -1 -2 -1 0
  1990 0 1 1 -3 -2 -1 -1 -2 -1 -3 0 0
  1991 -1 -1 -3 1 2 -1 -1 0 -1 2 1 3
  1992 2 1 1 1 0 3 -2 0 -1 -1 4 2
  1993 1 0 -1 -1 -1 -3 1 0 2 -1 0
  1994 0 0 -1 1 -1 -3 -3 -3 -4 -2 0 0
  1995 1 -1 0 -3 -3 -4 -3 -4 -5 -3 -1 -3
  1996 -2 -1 -4 -5 -4 -2 -4 -7 -5 -3 -3 -3
  1997 -2 -2 -5 -5 -4 -6 -5 -6 -5 -3 -2 -3
  1998 -4 -4 -5 -5 -6 -7 -8 -7 -5 -5 -3 -4
  1999 -3 -3 -5 -6 -7 -7 -5 -6 -6 -2 -2 -5
  2000 -1 -3 -3 -3 -8 -7 -7 -6 -6 -7 -5 -2
  2001 -3 -4 -2 -4 -4 -8 -7 -7 -5 -4 -5 -5
  2002 -5 -5 -7 -5 -7 -9 -11 -9 -7 -5 -6 -6
  2003 -6 -1 -5 -3 -9 -9 -9 -7 -9 -5 -6 -4
  2004 -4 -4 -6 -3 -7 -9 -8 -9 -9 -6 -6 -5
  2005 -5 -5 -8 -7 -9 -8 -8 -11 -6 -7 -6 -3
  2006 -7 -5 -9 -12 -11 -11 -10 -10 -11 -11 -9 -7
  2007 -7 -9 -9 -11 -14 -12 -11 -12 -12 -11 -11 -8
  2008 -10 -9 -11 -12 -10 -13 -7 -12 -11 -10 -11 -7
  2009 -12 -10 -11 -11 -13 -11 -13 -11

- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 10/29/2009
Next Release Date: Last Week of November 2009

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