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| Montana Natural Gas in Underground Storage - Change in Working Gas from Same Month Previous Year (Percent) | |||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991 | -2.5 | -1.5 | -1.5 | -1.0 | -1.7 | 0.1 | -0.2 | -0.5 | -1.8 | -3.2 | -3.9 | -3.3 |
| 1992 | -38.1 | -38.6 | -38.4 | -38.3 | -38.2 | -38.2 | -38.2 | -38.3 | -38.6 | -38.8 | -39.8 | -41.8 |
| 1993 | -13.0 | -15.6 | -17.8 | -19.4 | -21.2 | -22.4 | -22.0 | -22.3 | -21.6 | -20.7 | -20.8 | -19.6 |
| 1994 | -19.3 | -21.6 | -20.5 | -19.8 | -17.7 | -14.9 | -14.5 | -13.6 | -12.0 | -10.7 | -9.8 | -9.5 |
| 1995 | -9.6 | -5.3 | -4.7 | -2.5 | -2.0 | -1.5 | 0.6 | 3.4 | 2.5 | 0.4 | -1.3 | -4.9 |
| 1996 | -9.0 | -11.4 | -16.2 | -18.1 | -20.7 | -19.2 | -18.0 | -16.9 | -13.6 | -13.4 | -16.2 | -17.7 |
| 1997 | -18.5 | -20.5 | -19.6 | -21.9 | -19.3 | -20.3 | -20.1 | -20.8 | -22.7 | -23.8 | -22.5 | -20.6 |
| 1998 | -20.5 | -19.2 | -21.2 | -18.5 | -14.3 | -12.9 | -13.1 | -8.2 | -2.8 | 2.0 | 2.5 | 1.0 |
| 1999 | -0.1 | -2.2 | -0.7 | -3.7 | -8.7 | -8.9 | -9.6 | -12.8 | -17.2 | -20.5 | -18.8 | -17.7 |
| 2000 | -17.8 | -18.9 | -19.5 | -18.1 | -21.0 | -23.6 | -21.9 | -21.2 | -21.7 | -20.8 | -27.6 | -36.0 |
| 2001 | -40.7 | -49.1 | -51.0 | -49.9 | -38.5 | -25.2 | -11.9 | -2.7 | 9.1 | 13.9 | 26.5 | 37.3 |
| 2002 | -9.7 | -1.5 | -15.6 | -20.6 | -23.1 | -19.3 | -11.3 | -8.8 | -9.2 | -13.1 | -17.1 | -17.8 |
| 2003 | 27.2 | 19.4 | 25.0 | 34.8 | 24.2 | 5.9 | -13.7 | -22.1 | -27.2 | -22.1 | -25.8 | -28.7 |
| 2004 | -38.1 | -47.2 | -52.2 | -53.3 | -46.6 | -38.4 | -26.3 | -13.0 | 5.7 | 11.4 | 21.7 | 16.6 |
| 2005 | 18.7 | 37.2 | 47.2 | 61.2 | 62.6 | 60.7 | 46.6 | 29.8 | 8.7 | 0.4 | -0.5 | 0.5 |
| 2006 | 17.0 | 18.4 | 28.3 | 46.9 | 64.8 | 66.8 | 63.4 | 63.7 | 70.8 | 73.1 | 64.8 | 77.5 |
| 2007 | 74.0 | 83.9 | 92.6 | 55.2 | 27.5 | 12.5 | 6.1 | 1.7 | -5.8 | -7.0 | -1.2 | -3.1 |
| 2008 | -7.0 | -9.8 | -17.0 | -27.2 | -33.8 | -36.7 | -37.3 | -35.5 | -31.6 | -33.7 | -36.0 | -43.3 |
| 2009 | -50.2 | -53.2 | -58.2 | -36.1 | 8.2 | 39.3 | 58.5 | 72.9 | 80.9 | 92.7 | 115.8 | 145.0 |
| 2010 | 196.3 | 235.9 | 352.0 | 289.5 | 158.3 | 102.8 | 71.7 | 48.3 | 31.8 | 20.7 | 5.6 | 6.7 |
| 2011 | 6.5 | 5.2 | -6.2 | -22.8 | -33.8 | -36.1 | -36.4 | -35.9 | -34.9 | -31.6 | -30.3 | -29.8 |
| 2012 | -30.4 | -29.6 | -21.1 | -8.1 | 0.3 | 6.8 | 9.2 | 10.8 | 12.8 | 10.7 | 12.2 | 10.5 |
| 2013 | 8.0 | 7.8 | -3.1 | -19.0 | -20.3 | -22.0 | -20.6 | -17.4 | -12.8 | -15.3 | -22.4 | -28.3 |
| 2014 | -33.0 | -44.7 | -53.7 | -58.7 | -55.5 | -52.6 | -50.0 | -51.1 | -52.7 | -48.2 | -50.3 | -49.0 |
| 2015 | -52.9 | -52.1 | -33.6 | -7.9 | -0.8 | 5.8 | 7.8 | 13.9 | 13.3 | 9.4 | 17.3 | 19.2 |
| 2016 | 28.0 | 52.9 | 58.5 | 76.0 | 81.6 | 76.8 | 62.7 | 53.4 | 49.2 | 46.2 | 51.2 | 37.0 |
| 2017 | 30.2 | 20.1 | 5.2 | -6.6 | -10.0 | -10.8 | -8.8 | -11.0 | -5.2 | -5.0 | -9.7 | -9.4 |
| 2018 | -12.4 | -30.5 | -53.1 | -56.0 | -45.1 | -38.2 | -31.4 | -22.3 | -24.4 | -32.9 | -36.0 | -29.3 |
| 2019 | -34.1 | -51.6 | -43.9 | -22.9 | -26.6 | -18.5 | -16.5 | -16.9 | -9.7 | -4.1 | -4.6 | -15.8 |
| 2020 | -26.1 | -39.5 | -44.7 | -21.3 | 19.9 | 25.3 | 25.8 | 23.6 | 23.4 | 36.9 | 44.4 | 44.8 |
| 2021 | 63.2 | 124.5 | 92.6 | 15.9 | -20.0 | -25.8 | -24.4 | -15.9 | -11.0 | -10.2 | -8.2 | -10.1 |
| 2022 | -16.1 | -22.6 | -28.7 | -17.3 | 15.7 | 29.2 | 31.2 | 24.6 | 17.3 | 16.1 | 7.7 | 9.6 |
| 2023 | 36.0 | 83.0 | 110.9 | 105.4 | 52.9 | 33.1 | 27.7 | 14.9 | 5.1 | 1.1 | 10.7 | 23.9 |
| 2024 | 16.8 | 28.8 | 49.2 | 46.7 | 32.4 | 29.4 | 23.9 | 24.4 | 29.2 | 30.6 | 29.2 | 30.2 |
| 2025 | 37.8 | 41.5 | 49.6 | 12.6 | ||||||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 6/30/2025 |
| Next Release Date: 7/31/2025 |