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Refining District Minnesota-Wisconsin-North Dakota-South Dakota Refinery and Blender Net Input of Isobutane-Isobutylene (Thousand Barrels)
Refining District Minnesota-Wisconsin-North Dakota-South Dakota Refinery and Blender Net Input of Isobutane-Isobutylene (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1981 53 21 36 32 41 37 37 35 33 47 38 58
  1982 48 61 33 43 35 30 34 38 44 39 42 64
  1983 53 51 50 36 27 50 71 70 60 63 39 63
  1984 54 27 114 72 62 64 76 75 84 81 64 106
  1985 101 88 120 103 89 94 75 50 73 85 74 114
  1986 120 91 81 76 67 64 48 79 42 76 104 99
  1987 97 79 57 69 80 51 72 53 54 52 65 76
  1988 74 61 77 57 61 30 78 62 83 84 67 71
  1989 77 63 72 64 41 39 40 39 96 66 96 90
  1990 80 70 102 56 61 68 51 89 71 86 92 77
  1991 87 110 68 78 104 94 95 67 111 67 105 122
  1992 111 95 121 101 129 99 144 109 132 128 110 119
  1993 124 136 94 37 64 79 88 111 104 141 116 121
  1994 116 82 82 79 50 94 120 101 64 87 98 135
  1995 106 98 63 58 64 59 77 91 73 70 96 93
  1996 89 66 57 65 83 57 60 45 65 90 78 48
  1997 52 69 56 71 71 47 74 59 65 55 67 59
  1998 10 19 38 43 13 8 35 13 21 73 52 38
  1999 33 38 49 54 65 55 60 51 68 49 44 33
  2000 25 31 51 36 41 62 63 62 30 41 32 43
  2001 47 58 69 57 77 67 58 56 58 52 56 71
  2002 89 74 73 62 55 45 64 68 60 61 58 57
  2003 59 46 59 64 58 57 63 70 14 41 71 58
  2004 58 58 80 58 58 56 57 54 47 73 99 85
  2005 77 64 61 61 69 69 79 86 69 71 49 41
  2006 58 53 55 59 37 65 66 61 54 24 41 46
  2007 46 44 55 61 60 53 49 63 55 49 36 30
  2008 35 43 50 52 59 66 58 52 35 41 38 29
  2009 31 32 30 25 43 42 53 49 64 38 38 61
  2010 43 38 29 19 15 51 56 55 54 58 68 44
  2011 34 6 11 53 49 47 50 46 53 63 33 43
  2012 52 43 44 25 35 22 45 34 44 37 39 38
  2013 34 35 29

- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 5/30/2013
Next Release Date: Last Week of June 2013

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