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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
U.S. Isobutane-Isobutylene Imports (Thousand Barrels per Day)
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1984
29
23
24
19
21
21
14
17
21
26
37
39
1985
39
29
30
20
22
28
19
14
19
33
34
52
1986
40
45
48
27
36
55
65
55
37
36
51
44
1987
40
45
29
33
28
28
42
46
57
39
44
48
1988
35
37
25
41
30
23
38
42
30
39
48
34
1989
13
15
10
6
8
12
18
23
18
25
6
10
1990
14
22
8
9
13
27
21
44
15
3
6
10
1991
9
7
11
13
17
21
20
21
5
14
10
2
1992
4
6
4
13
7
6
6
15
10
12
4
4
1993
4
10
9
14
13
8
11
13
11
21
10
20
1994
3
9
9
11
7
12
20
15
14
16
12
6
1995
22
8
4
12
11
17
20
20
12
2
7
7
1996
14
4
15
10
14
21
21
15
17
11
2
9
1997
7
12
18
20
24
22
18
20
18
11
7
11
1998
17
24
15
16
27
20
19
13
18
9
3
6
1999
8
7
5
11
15
17
21
3
10
14
15
14
2000
16
15
10
16
19
30
23
10
7
6
8
2
2001
3
8
15
33
34
35
4
17
9
2
2
4
2002
2
12
18
13
13
9
6
5
1
0
1
1
2003
1
11
4
16
11
21
22
28
22
7
10
4
2004
7
23
14
15
15
7
21
27
21
3
9
8
2005
16
28
22
34
30
31
33
41
31
36
21
13
2006
22
18
9
43
56
44
45
44
60
32
17
21
2007
23
10
22
21
24
37
25
22
11
22
11
13
2008
15
25
11
27
Updated on 6/26/2008
Source: U.S. Energy Information Administration
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