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Download Data (XLS File)
West Coast (PADD 5) Natural Gas Plant Stocks of Isobutane (Thousand Barrels)
West Coast (PADD 5) Natural Gas Plant Stocks of Isobutane (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 75 111 37 63 75 34 24 44 31 24 55
  2014 46 40 62 67 22 101 51 53 51 24 64 58
  2015 26 97 34 32 25 46 75 79 59 59 21 30
  2016 43 39 57 41 60 73 51 54 114 50 34 27
  2017 6 30 31 9 39 44 43 36 42 19 28 27
  2018 7 21 77 49 26 44 39 76 48 34 19 26
  2019 32 9 13 16 31 28 42 19 33 27 16 12
  2020 43 32 66 22 18 21 24 12 35 27 24 29
  2021 29 43 26 70 47 54 23 24 22 36 72 42
  2022 25 11 28 21 7 33 34 11 17 33 17 22
  2023 47 30 16 42 55 49 24 25 32 37 51 36
  2024 6 14 25 7 25 22 23 21 17 8 27 27
  2025 13 13 9 14 26 21 15 19

- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 10/31/2025
Next Release Date: 11/28/2025

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