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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 Imports (Thousand Barrels)
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1984
96
106
90
78
61
48
61
64
73
166
130
166
1985
112
99
89
48
45
53
91
106
101
77
86
98
1986
118
101
75
81
79
68
61
49
80
46
97
80
1987
100
101
98
88
55
66
68
50
58
103
84
110
1988
103
79
72
52
82
37
49
49
53
33
67
86
1989
23
13
14
2
7
7
10
6
14
13
15
22
1990
9
28
32
17
30
31
33
32
26
21
50
29
1991
15
9
6
15
47
16
11
7
12
16
26
14
1992
22
10
7
5
5
5
5
24
25
23
14
11
1993
3
13
8
12
23
4
16
19
10
5
21
14
1994
12
19
11
5
4
1
1
5
1
11
1995
10
2
4
3
14
12
7
15
56
14
1996
8
14
37
14
13
69
29
43
43
31
9
1997
8
12
32
32
23
23
15
1998
1
1999
5
4
11
14
16
17
18
23
10
2000
5
11
10
3
13
12
13
2001
16
19
5
6
2002
8
2004
2
21
2
2007
5
Updated on 6/26/2008
Source: U.S. Energy Information Administration
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