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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
West Coast (PADD 5) Isobutane-Isobutylene Stock Change (Thousand Barrels)
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1981
-71
-45
-101
-39
23
173
105
11
39
-66
35
-82
1982
-48
-51
-30
-93
-73
18
-21
20
-2
17
-22
60
1983
35
-32
24
19
-20
60
120
-124
28
-32
-23
37
1984
-65
-63
-30
-18
108
0
24
14
-38
-25
3
24
1985
-10
1
27
-41
14
10
13
-42
-29
12
-87
96
1986
-86
-13
238
135
-90
-130
94
-103
-20
-75
30
-16
1987
-38
11
15
-23
47
26
19
54
23
-4
38
-19
1988
41
-43
-7
-71
-68
18
47
37
699
-327
-155
-119
1989
65
-17
-134
164
14
36
38
44
10
-122
-57
-145
1990
87
-27
-57
17
89
-17
86
-71
34
-32
-95
-24
1991
114
33
80
-121
64
70
-56
76
-32
-98
-47
-22
1992
73
-2
-34
-14
107
54
-27
28
25
-32
-115
-28
1993
79
-13
124
9
63
70
-3
-50
-32
18
-51
89
1994
-132
-20
8
-11
-32
54
118
67
-115
-68
-24
-30
1995
-10
-7
74
-93
21
51
77
10
72
-61
-33
-116
1996
-16
50
-94
173
-215
218
-115
62
103
45
-166
-120
1997
-25
124
-51
15
40
87
35
-76
132
76
-80
-135
1998
-14
93
-51
-81
-20
140
11
-73
-25
76
-159
-45
1999
-47
130
-1
47
-72
203
-152
84
-31
-23
-175
2000
-97
113
7
88
-35
54
225
-117
-142
38
33
27
2001
-138
-100
145
26
104
-66
26
-86
-13
34
-17
-91
2002
-71
6
116
43
14
28
-101
41
-10
144
-180
-116
2003
22
66
100
98
-125
136
-98
90
127
49
-26
-143
2004
-17
-92
-80
36
91
7
-7
51
143
-146
28
36
2005
-18
53
-110
58
-141
82
-43
68
119
-8
-68
-186
2006
93
75
22
-6
79
44
-34
-115
-22
-175
75
6
2007
-130
169
34
121
58
-94
-37
-7
17
-121
37
-24
2008
292
-194
151
-125
Updated on 6/26/2008
Source: U.S. Energy Information Administration
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