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| Refining District Minnesota-Wisconsin-North Dakota-South Dakota Isobutane-Isobutylene Stocks at Refineries (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1993 | 90 | 93 | 95 | 95 | 114 | 100 | 76 | 73 | 79 | 76 | 64 | 80 |
| 1994 | 85 | 98 | 51 | 75 | 82 | 73 | 81 | 96 | 81 | 53 | 56 | 98 |
| 1995 | 95 | 85 | 72 | 34 | 71 | 85 | 78 | 119 | 102 | 110 | 73 | 83 |
| 1996 | 64 | 87 | 67 | 82 | 97 | 110 | 110 | 87 | 88 | 88 | 99 | 96 |
| 1997 | 64 | 57 | 58 | 97 | 92 | 73 | 101 | 89 | 108 | 104 | 85 | 75 |
| 1998 | 87 | 82 | 97 | 83 | 56 | 78 | 65 | 77 | 70 | 70 | 57 | 46 |
| 1999 | 53 | 48 | 39 | 53 | 56 | 62 | 47 | 66 | 51 | 58 | 50 | 53 |
| 2000 | 48 | 29 | 52 | 32 | 39 | 43 | 42 | 53 | 55 | 46 | 53 | 43 |
| 2001 | 50 | 57 | 36 | 38 | 49 | 47 | 56 | 49 | 38 | 49 | 63 | 58 |
| 2002 | 41 | 44 | 60 | 36 | 52 | 53 | 62 | 45 | 41 | 60 | 52 | 53 |
| 2003 | 55 | 56 | 62 | 42 | 52 | 54 | 44 | 39 | 54 | 46 | 32 | 39 |
| 2004 | 49 | 39 | 50 | 51 | 50 | 45 | 52 | 34 | 51 | 40 | 61 | 50 |
| 2005 | 53 | 56 | 58 | 62 | 47 | 48 | 57 | 57 | 62 | 47 | 53 | 55 |
| 2006 | 50 | 56 | 61 | 55 | 66 | 55 | 53 | 69 | 53 | 83 | 67 | 57 |
| 2007 | 66 | 78 | 71 | 75 | 78 | 87 | 89 | 66 | 67 | 65 | 61 | 70 |
| 2008 | 71 | 59 | 80 | 73 | 60 | 56 | 85 | 89 | 96 | 67 | 56 | 49 |
| 2009 | 65 | 71 | 84 | 118 | 72 | 65 | 59 | 66 | 57 | 63 | 74 | 45 |
| 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 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2023 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2024 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2025 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2026 | -- | |||||||||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 3/31/2026 |
| Next Release Date: 4/30/2026 |