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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 Imports (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1984 164 176 170 134 149 143 90 185 107 130 135 143
  1985 213 88 248 98 92 32 176 21 34 53 71 207
  1986 135 105 246 69 76 59 73 118 114 114 353 255
  1987 201 178 90 132 83 67 41 43 47 79 84 303
  1988 84 93 87 66 98 68 30 50 80 131 218 122
  1989 90 22 32 22 60 60 49 43 73 32 44 129
  1990 34 40 35 45 41 10 40 26 52 11 19 11
  1991 0 17 49 35 43 44 0 11 0 9 0 17
  1992 25 14 11 7 26 20 20 14 19 9 0 15
  1993 5 6 12 15 10 13 11 4 2 1 4
  1994 4 15 28 54 121 113
  1995 390 44 58 26 23 3 18 2 4 148 181
  1996 166 113 59 36 44 28 10 14
  1997 66 2
  2000 21
  2001 14 8
  2004 15 4 6 0 0
  2005 11
  2006 38 2
  2007 4 7 7 7

Updated on 6/26/2008
Source: U.S. Energy Information Administration
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