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View History:
Monthly
Annual
Download Data (XLS File)
Rocky Mountain (PADD 4) Isobutane-Isobutylene Stock Change (Thousand Barrels)
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1981
32
21
2
3
-10
-6
24
-10
-1
-8
-5
29
1982
13
-20
9
-9
-10
-4
-5
-8
3
-1
-6
-7
1983
-35
16
7
-6
1
-4
-9
15
4
5
-20
19
1984
4
-16
-4
9
-3
-9
24
-13
9
6
-18
-5
1985
-2
19
-16
-10
7
0
5
2
-18
5
-13
12
1986
-1
25
-4
20
-29
1
63
-18
20
-5
8
-36
1987
7
21
-7
-17
-16
17
-5
-5
3
-1
14
5
1988
19
-13
6
-24
-12
0
12
3
67
-7
-25
-39
1989
17
0
-8
-15
-3
-15
31
-2
-13
48
-44
12
1990
1
-5
43
-20
3
-14
-10
13
4
5
7
-18
1991
-3
0
3
16
-7
-10
11
-10
17
-28
-9
20
1992
46
3
-1
-9
26
-81
16
-36
50
38
1
-21
1993
-21
3
37
33
10
-6
-51
11
-4
-15
37
3
1994
-62
19
49
5
-25
6
-7
-21
22
27
-53
-17
1995
9
12
17
-31
-8
-13
-10
13
17
-37
6
50
1996
-43
-13
30
60
-36
-27
5
-22
44
-2
-29
-1
1997
8
-27
38
3
2
-4
-17
21
42
-15
-44
-16
1998
26
41
-11
-33
-21
22
38
6
-4
4
-1
-13
1999
-11
6
-23
-1
-26
15
21
-24
-26
9
113
2000
-21
22
-5
-35
16
6
-20
11
-13
-6
-21
9
2001
19
11
7
-30
-7
39
7
-47
8
-18
11
-3
2002
-2
17
67
-22
-10
-26
31
-4
-5
14
-9
-9
2003
48
14
11
-56
-33
-9
-1
-1
12
-33
1
14
2004
9
-13
33
-62
-11
19
-11
9
34
-27
-14
7
2005
-5
-4
26
-26
19
0
-32
37
5
-37
0
11
2006
9
11
-33
32
6
13
-43
14
8
-1
9
-47
2007
12
9
36
-27
-7
-12
25
6
23
-32
2
1
2008
7
-3
8
-4
-2
Release Date: 7/28/2008
Next Release Date: Last Week of August 2008
Referring Pages:
Isobutane/Isobutylene Supply and Disposition
Rocky Mountain (PADD 4) Supply and Disposition
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