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Refining District Minnesota-Wisconsin-North Dakota-South Dakota Refinery Stocks of Isobutane (Thousand Barrels)
Refining District Minnesota-Wisconsin-North Dakota-South Dakota Refinery Stocks of Isobutane (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  2010 63 79 93 63 79 88 84 73 82 68 69 81
  2011 92 106 120 52 79 102 98 100 57 60 94 85
  2012 81 80 72 76 90 88 76 74 81 86 84 70
  2013 84 71 82 78 64 49 66 70 43 52 53 62
  2014 71 56 76 82 486 537 88 91 98 87 68 62
  2015 94 126 102 91 88 88 103 91 71 68 68 66
  2016 68 83 72 72 71 75 68 79 69 82 68 50
  2017 62 74 61 47 65 72 83 71 59 57 66 59
  2018 74 69 65 45 48 65 69 78 75 45 47 36
  2019 28 47 33 47 45 47 60 51 59 49 35 46
  2020 62 45 57 45 43 31 51 48 43 44 48 51
  2021 42 45 32 53 53 37 39 29 48 36 49 35
  2022 52 37 42 42 41 47 43 30 40 37 44 38
  2023 49 46 39 42 30 36 59 41 37 53 32 54
  2024 50 34 54 44 41 49 55 31 53 37 30 32
  2025 39 37 31 52 34 59 49 39 34 34 49 36

- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 2/27/2026
Next Release Date: 3/31/2026

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