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| Rocky Mountain (PADD 4) Refinery and Blender Net Input 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 | 152 | 108 |
| 2009 | 156 | 161 | 154 | 161 | 221 | 211 | 245 | 200 | 260 | 213 | 187 | 126 |
| 2010 | 174 | 174 | 190 | 196 | 226 | 202 | 236 | 220 | 239 | 201 | 172 | 155 |
| 2011 | 140 | 142 | 209 | 188 | 197 | 222 | 203 | 210 | 189 | 212 | 214 | 171 |
| 2012 | 196 | 191 | 223 | 290 | 219 | 243 | 241 | 199 | 205 | 190 | 171 | 181 |
| 2013 | 182 | 162 | ||||||||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 4/29/2013 |
| Next Release Date: Last Week of May 2013 |