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| Rocky Mountain (PADD 4) Gas Plant Production of Isobutane-Isobutylene (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1981 | 7 | 5 | 6 | 4 | 5 | 5 | 4 | 3 | 2 | 4 | 7 | 7 |
| 1982 | 6 | 4 | 4 | 3 | 3 | 3 | 6 | 6 | 7 | 10 | 8 | 9 |
| 1983 | 10 | 6 | 7 | 5 | 5 | 5 | 5 | 4 | 6 | 5 | 5 | 6 |
| 1984 | 111 | 105 | 115 | 111 | 126 | 118 | 143 | 124 | 133 | 150 | 155 | 150 |
| 1985 | 162 | 152 | 154 | 147 | 150 | 134 | 144 | 150 | 172 | 159 | 159 | 159 |
| 1986 | 169 | 137 | 170 | 155 | 170 | 146 | 153 | 155 | 148 | 163 | 149 | 163 |
| 1987 | 163 | 161 | 181 | 184 | 190 | 165 | 168 | 180 | 168 | 175 | 178 | 208 |
| 1988 | 217 | 219 | 244 | 232 | 242 | 228 | 240 | 225 | 213 | 252 | 240 | 234 |
| 1989 | 228 | 216 | 251 | 238 | 235 | 183 | 229 | 230 | 231 | 240 | 241 | 239 |
| 1990 | 243 | 225 | 246 | 242 | 243 | 226 | 217 | 220 | 217 | 228 | 226 | 226 |
| 1991 | 254 | 247 | 258 | 283 | 309 | 305 | 344 | 323 | 317 | 311 | 276 | 283 |
| 1992 | 300 | 299 | 304 | 329 | 349 | 331 | 332 | 320 | 328 | 328 | 386 | 313 |
| 1993 | 290 | 284 | 327 | 320 | 307 | 295 | 312 | 314 | 310 | 328 | 299 | 301 |
| 1994 | 262 | 255 | 292 | 302 | 308 | 309 | 312 | 300 | 326 | 320 | 307 | 328 |
| 1995 | 325 | 278 | 323 | 301 | 338 | 317 | 337 | 326 | 306 | 307 | 304 | 327 |
| 1996 | 314 | 288 | 309 | 309 | 317 | 305 | 310 | 322 | 283 | 287 | 272 | 290 |
| 1997 | 281 | 265 | 316 | 309 | 320 | 307 | 304 | 293 | 324 | 304 | 275 | 301 |
| 1998 | 294 | 291 | 312 | 299 | 313 | 316 | 330 | 308 | 314 | 319 | 294 | 277 |
| 1999 | 310 | 279 | 317 | 311 | 324 | 350 | 341 | 336 | 336 | 345 | 348 | 369 |
| 2000 | 358 | 333 | 364 | 347 | 369 | 335 | 344 | 375 | 356 | 368 | 345 | 345 |
| 2001 | 335 | 309 | 338 | 353 | 374 | 350 | 342 | 344 | 331 | 320 | 321 | 318 |
| 2002 | 324 | 322 | 335 | 331 | 347 | 319 | 318 | 334 | 338 | 357 | 318 | 338 |
| 2003 | 325 | 301 | 326 | 307 | 315 | 320 | 296 | 328 | 309 | 331 | 305 | 323 |
| 2004 | 310 | 316 | 348 | 334 | 328 | 333 | 343 | 340 | 332 | 326 | 290 | 303 |
| 2005 | 288 | 280 | 317 | 297 | 321 | 301 | 324 | 312 | 294 | 305 | 287 | 279 |
| 2006 | 274 | 238 | 274 | 268 | 275 | 276 | 269 | 284 | 274 | 251 | 277 | 259 |
| 2007 | 280 | 252 | 284 | 238 | 262 | 256 | 262 | 265 | 285 | 282 | 305 | 302 |
| 2008 | 300 | 327 | 367 | 327 | 362 | 358 | 373 | 360 | 360 | 326 | 336 | 316 |
| 2009 | 331 | 307 | 352 | 356 | 387 | 374 | 376 | 362 | 349 | 392 | 395 | 377 |
| 2010 | 410 | 370 | 418 | 416 | 420 | 392 | 388 | 397 | 385 | 389 | 400 | 394 |
| 2011 | 432 | 387 | 426 | 443 | 423 | 398 | 439 | 444 | 427 | 452 | 430 | 442 |
| 2012 | 448 | 418 | 438 | 412 | 427 | 400 | 407 | 414 | 477 | 511 | 494 | 496 |
| 2013 | 486 | 443 | ||||||||||
| - = 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 |