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West Coast (PADD 5) Isobutane-Isobutylene Stocks at Natural Gas Processing Plants (Thousand Barrels)
West Coast (PADD 5) Isobutane-Isobutylene Stocks at Natural Gas Processing Plants (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1993 14 8 17 11 14 9 24 29 29 27 23 56
  1994 42 7 21 21 23 11 11 23 16 7 9 4
  1995 13 4 7 1 10 3 18 12 12 19 9 37
  1996 12 12 10 12 8 8 14 10 6 5 7 9
  1997 6 32 18 10 9 17 14 20 20 60 46 28
  1998 19 21 12 13 13 12 12 12 12 10 48 10
  1999 10 10 16 24 12 16 54 14 9 21 61 28
  2000 35 42 10 8 18 14 26 11 11 12 33 32
  2001 15 8 15 5 30 26 15 11 20 5 5 6
  2002 1 1 3 3 3 13 3 3 3 17 17 9
  2003 15 5 18 16 22 25 7 6 45 55 38 32
  2004 37 23 6 12 18 25 30 27 6 49 9 20
  2005 22 32 12 10 27 9 26 11 7 45 55 46
  2006 30 17 43 42 26 31 20 9 42 6 48 7
  2007 6 6 7 23 26 22 9 7 65 46 16 47
  2008 91 16 38 64 85 4 10 25 27 24 27 40
  2009 13 26 24 6 6 6 10 50 15 25 41 37
  2010 38 79 33 93 47 52 36 22 45 75 54 49
  2011 27 24 16 29 15 68 100 28 35 39 46 59
  2012 48 23 24 80 73 59 80 62 72 57 48 43
  2013 13 75

- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 4/29/2013
Next Release Date: Last Week of May 2013

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