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Rocky Mountains (PADD 4) Refinery and Blender Net Inputs of Isobutane/Isobutylene (Thousand Barrels)
Rocky Mountains (PADD 4) Refinery and Blender Net Inputs of Isobutane/Isobutylene (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1981 67 87 80 75 62 69 75 67 79 66 76 50
  1982 47 73 48 50 46 41 56 57 60 74 55 63
  1983 66 21 55 49 47 55 62 41 52 46 47 39
  1984 36 52 57 39 84 80 69 83 58 58 62 65
  1985 77 46 63 58 92 70 73 62 75 56 57 57
  1986 64 40 73 92 114 78 91 235 83 108 46 100
  1987 79 55 68 59 43 76 59 105 76 73 91 103
  1988 103 104 90 91 104 114 125 136 98 100 89 99
  1989 81 63 71 51 57 120 118 102 107 98 105 73
  1990 52 84 95 79 105 118 117 104 108 95 83 116
  1991 99 109 112 91 112 119 144 116 124 113 76 80
  1992 76 82 103 105 107 97 112 119 91 112 94 107
  1993 112 93 113 60 73 112 120 109 103 159 109 138
  1994 127 129 120 119 119 119 133 96 108 111 91 125
  1995 100 79 94 87 110 129 113 122 143 98 128 135
  1996 117 94 154 130 108 128 154 152 147 116 101 78
  1997 103 106 108 151 137 159 136 144 160 123 129 122
  1998 77 74 121 62 98 82 84 86 81 83 92 136
  1999 132 107 122 148 150 175 167 176 156 150 126 133
  2000 118 117 122 133 157 148 182 178 168 202 157 113
  2001 112 107 86 113 135 133 166 169 155 157 170 125
  2002 110 113 123 152 178 155 170 169 154 109 89 87
  2003 89 66 111 114 134 179 157 149 166 151 127 85
  2004 71 84 137 123 145 159 173 160 165 146 104 126
  2005 84 93 128 136 149 151 171 166 165 122 99 52
  2006 129 114 211 182 205 203 229 231 181 194 198 187
  2007 168 176 172 194 228 222 262 226 229 219 190 155
  2008 199 183 205 187 223 235 201 194 193 161

- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 12/29/2008
Next Release Date: Last Week of January 2009

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