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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
Midwest (PADD 2) Isobutane-Isobutylene Imports (Thousand Barrels per Day)
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1984
14
12
10
7
7
8
6
7
9
14
20
15
1985
13
12
15
9
9
9
6
8
12
13
15
19
1986
15
12
10
9
9
6
11
9
8
11
21
11
1987
18
14
11
11
9
11
11
7
11
13
20
17
1988
12
14
12
10
6
7
9
9
8
11
17
13
1989
4
4
3
1
1
3
3
2
3
3
3
2
1990
9
7
1
1
0
0
0
0
0
0
0
6
1991
7
5
6
3
9
1
6
1
2
1
2
1
1992
2
5
3
1
3
3
2
3
1
2
2
1
1993
4
3
4
11
5
5
5
5
8
6
6
8
1994
2
5
6
8
5
3
9
10
3
7
0
2
1995
6
4
2
7
8
7
11
10
5
0
0
0
1996
4
2
1
1
3
0
5
3
10
2
9
1997
5
11
4
5
7
9
9
8
7
5
7
8
1998
13
8
8
7
9
4
4
9
5
9
3
6
1999
8
7
5
2
6
10
11
2
9
11
10
11
2000
11
12
9
13
14
12
14
7
4
4
5
2
2001
1
0
2
1
2
1
0
0
1
0
0
0
2002
0
0
0
0
0
1
0
0
0
1
1
2003
1
0
1
0
1
1
1
3
2
1
1
0
2004
0
2
2
2
1
2
4
9
3
3
3
4
2005
4
5
4
2
3
6
4
3
9
7
6
3
2006
5
4
5
5
5
4
6
6
3
4
5
6
2007
5
4
6
3
3
6
6
7
2
3
3
4
2008
6
6
6
3
Updated on 6/26/2008
Source: U.S. Energy Information Administration
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