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Note: These data are available in spreadsheet format by clicking the ''Download Series History'' link on the previous page (with drop-down menu bar at top).
View History:
Monthly
Annual
Rocky Mountain (PADD 4) Isobutane-Isobutylene Product Supplied (Thousand Barrels)
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1989
26
14
27
28
-17
-150
-188
-78
-35
-50
-21
11
1990
13
15
41
-77
-74
-31
-21
-53
-27
-97
13
13
1991
-17
-41
-78
25
70
-23
-18
-10
-19
67
27
80
1992
52
19
40
44
7
87
-48
6
-42
-22
109
55
1993
40
8
-19
-23
-35
-93
34
-7
51
-20
14
1994
6
-13
-29
18
-38
-89
-102
-100
-125
-52
-4
-10
1995
18
-24
-14
-88
-87
-113
-85
-119
-143
-96
-34
-82
1996
-66
-31
-121
-161
-113
-56
-119
-219
-154
-92
-95
-86
1997
-66
-54
-146
-163
-110
-184
-168
-193
-162
-101
-60
-102
1998
-139
-112
-149
-138
-201
-210
-235
-202
-146
-142
-82
-134
1999
-85
-78
-164
-173
-222
-222
-160
-185
-181
-77
-50
-161
2000
-26
-78
-98
-83
-260
-214
-225
-195
-194
-221
-142
-67
2001
-108
-102
-57
-134
-127
-230
-213
-209
-164
-122
-137
-153
2002
-148
-135
-219
-163
-221
-261
-342
-268
-209
-159
-168
-172
2003
-176
-32
-148
-78
-293
-271
-276
-225
-265
-165
-179
-137
2004
-123
-110
-178
-89
-209
-279
-263
-294
-281
-191
-179
-162
2005
-157
-152
-234
-200
-290
-254
-251
-331
-188
-207
-187
-105
2006
-221
-135
-292
-354
-331
-331
-308
-316
-316
-329
-279
-231
2007
-231
-245
-281
-340
-431
-376
-356
-366
-362
-326
-323
-247
2008
-306
-309
-400
-345
Updated on 6/26/2008
Source: U.S. Energy Information Administration
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