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| Midwest (PADD 2) Gas Plant Production of Normal Butane-Butylene (Thousand Barrels per Day) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1981 | 60 | 54 | 52 | 54 | 52 | 49 | 46 | 48 | 46 | 47 | 44 | 49 |
| 1982 | 53 | 52 | 44 | 49 | 44 | 39 | 40 | 43 | 38 | 38 | 48 | 48 |
| 1983 | 51 | 43 | 40 | 38 | 38 | 43 | 37 | 41 | 39 | 43 | 50 | 53 |
| 1984 | 42 | 39 | 35 | 35 | 38 | 37 | 37 | 36 | 36 | 41 | 44 | 45 |
| 1985 | 44 | 44 | 41 | 39 | 37 | 39 | 41 | 39 | 40 | 41 | 42 | 42 |
| 1986 | 47 | 46 | 42 | 35 | 33 | 35 | 35 | 35 | 34 | 36 | 42 | 44 |
| 1987 | 43 | 43 | 37 | 37 | 35 | 33 | 35 | 34 | 35 | 39 | 44 | 45 |
| 1988 | 42 | 41 | 40 | 40 | 40 | 37 | 38 | 37 | 39 | 40 | 40 | 45 |
| 1989 | 42 | 40 | 40 | 42 | 40 | 38 | 38 | 36 | 35 | 36 | 39 | 41 |
| 1990 | 42 | 40 | 37 | 36 | 35 | 34 | 33 | 37 | 38 | 43 | 40 | 39 |
| 1991 | 41 | 40 | 36 | 36 | 36 | 35 | 34 | 35 | 35 | 35 | 40 | 42 |
| 1992 | 40 | 39 | 36 | 34 | 34 | 34 | 33 | 35 | 37 | 37 | 38 | 39 |
| 1993 | 42 | 37 | 36 | 36 | 34 | 36 | 33 | 36 | 34 | 36 | 44 | 44 |
| 1994 | 40 | 36 | 37 | 43 | 44 | 40 | 35 | 34 | 38 | 43 | 45 | 41 |
| 1995 | 41 | 40 | 37 | 40 | 38 | 38 | 39 | 41 | 37 | 41 | 40 | 39 |
| 1996 | 38 | 34 | 36 | 36 | 27 | 27 | 29 | 29 | 39 | 34 | 40 | 41 |
| 1997 | 41 | 41 | 31 | 28 | 30 | 29 | 36 | 41 | 39 | 38 | 34 | 34 |
| 1998 | 37 | 34 | 37 | 38 | 35 | 32 | 33 | 33 | 35 | 38 | 39 | 34 |
| 1999 | 36 | 35 | 34 | 30 | 30 | 31 | 31 | 30 | 32 | 36 | 32 | 36 |
| 2000 | 35 | 32 | 28 | 33 | 28 | 26 | 29 | 29 | 33 | 33 | 30 | 30 |
| 2001 | 27 | 33 | 30 | 27 | 26 | 26 | 26 | 26 | 32 | 30 | 32 | 34 |
| 2002 | 32 | 25 | 29 | 34 | 36 | 35 | 35 | 35 | 35 | 36 | 33 | 27 |
| 2003 | 26 | 27 | 28 | 23 | 23 | 24 | 31 | 31 | 33 | 37 | 35 | 36 |
| 2004 | 36 | 35 | 30 | 31 | 35 | 36 | 31 | 29 | 35 | 38 | 34 | 34 |
| 2005 | 36 | 37 | 37 | 33 | 29 | 34 | 29 | 28 | 26 | 25 | 25 | 25 |
| 2006 | 33 | 30 | 22 | 24 | 26 | 26 | 31 | 32 | 31 | 35 | 35 | 29 |
| 2007 | 29 | 28 | 26 | 28 | 26 | 31 | 29 | 31 | 24 | 35 | 37 | 29 |
| 2008 | 24 | 32 | 27 | 30 | 29 | 29 | 26 | 25 | 32 | 28 | 29 | 32 |
| 2009 | 38 | 37 | 36 | 36 | 34 | 35 | 35 | 35 | 36 | 34 | 35 | 36 |
| 2010 | 38 | 37 | 37 | 39 | 39 | 39 | 41 | 42 | 43 | 43 | 42 | 40 |
| 2011 | 40 | 38 | 40 | 44 | 44 | 44 | 45 | 46 | 49 | 48 | 47 | 48 |
| 2012 | 49 | 51 | 51 | 54 | 56 | 45 | 44 | 45 | 48 | 49 | 47 | 51 |
| 2013 | 53 | 54 | ||||||||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 4/29/2013 |
| Next Release Date: Last Week of May 2013 |