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| Rocky Mountain (PADD 4) Ethane-Ethylene Stocks at Natural Gas Processing Plants (Thousand Barrels) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1993 | 6 | 4 | 6 | 5 | 2 | 2 | 1 | 1 | 1 | 1 | 2 | 2 |
| 1994 | 1 | 2 | 1 | 3 | 2 | 5 | 2 | 2 | 1 | 4 | 3 | 3 |
| 1995 | 3 | 5 | 3 | 3 | 4 | 3 | 3 | 2 | 2 | 2 | 3 | 2 |
| 1996 | 5 | 2 | 3 | 3 | 3 | 3 | 4 | 3 | 3 | 3 | 3 | 3 |
| 1997 | 2 | 3 | 3 | 4 | 3 | 4 | 4 | 3 | 3 | 5 | 3 | 2 |
| 1998 | 2 | 1 | 3 | 5 | 4 | 3 | 3 | 3 | 4 | 4 | 3 | 3 |
| 1999 | 1 | 3 | 2 | 4 | 3 | 2 | 5 | 4 | 4 | 4 | 3 | 2 |
| 2000 | 2 | 3 | 2 | 3 | 2 | 2 | 3 | 7 | 6 | 2 | 3 | 3 |
| 2001 | 2 | 2 | 2 | 5 | 9 | 5 | 4 | 10 | 13 | 17 | 19 | 21 |
| 2002 | 27 | 33 | 21 | 37 | 48 | 59 | 71 | 65 | 73 | 80 | 72 | 77 |
| 2003 | 101 | 190 | 214 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 2 |
| 2004 | 2 | 67 | 67 | 46 | 47 | 26 | 2 | 2 | 4 | 3 | 3 | 4 |
| 2005 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 2006 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 |
| 2007 | 2 | 2 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 |
| 2008 | 1 | 2 | 1 | 1 | 1 | 2 | ||||||
| 2009 | 1 | 1 | 1 | 1 | 5 | 5 | 5 | 6 | 6 | 6 | ||
| 2010 | 6 | 6 | 6 | 9 | 6 | 6 | 5 | 5 | 2 | 2 | 2 | 2 |
| 2011 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 2 | 2 | 2 | 2 | 2 |
| 2012 | 2 | 2 | 2 | 2 | 2 | 4 | 3 | 2 | 2 | 2 | 2 | 2 |
| 2013 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 2014 | 1 | 2 | 1 | 1 | 2 | 2 | 1 | 2 | 1 | 1 | 2 | 2 |
| 2015 | 2 | 2 | 3 | 1 | 1 | 2 | 1 | 1 | 1 | 2 | 1 | 1 |
| 2016 | 1 | 2 | 2 | 3 | 4 | 2 | 2 | 1 | ||||
| 2017 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | |||||
| 2018 | 2 | 4 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | |
| 2019 | 4 | 6 | 25 | 4 | 5 | 7 | 5 | 5 | 7 | 5 | 6 | 6 |
| 2020 | 5 | 6 | 7 | 6 | 5 | 4 | 6 | 7 | 7 | 7 | 4 | 4 |
| 2021 | 4 | 6 | 6 | 6 | 5 | 5 | 6 | 4 | 5 | 5 | 4 | 6 |
| 2022 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2023 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2024 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 2025 | -- | -- | -- | -- | -- | -- | -- | -- | ||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 10/31/2025 |
| Next Release Date: 11/28/2025 |