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|View History: Monthly Download Data (XLS File)                                                               
|View History: Monthly                                                                                         
|View History: Monthly                                                                                         
|View History:                                                                                                 
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|Washington Natural Gas in Underground Storage - Change in Working Gas from Same Month Previous Year  (Percent)
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|Washington Natural Gas in Underground Storage - Change in Working Gas from Same Month Previous Year  (Percent)
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|Year                                                                                                                              | Jan   | Feb   | Mar   | Apr   | May    | Jun   | Jul   | Aug   | Sep   | Oct   | Nov   | Dec  
|--------------------------------------------------------------------------------------------------------------------------------- | ----- | ----- | ----- | ----- | ------ | ----- | ----- | ----- | ----- | ----- | ----- | -----
|1991                                                                                                                              | -26.2 | 22.8  | 6.2   | 168.1 | -141.5 | 111.4 | 60.1  | 16.3  | 5.9   | 16.1  | 23.8  | 63.1 
|1992                                                                                                                              | 94.7  | 51.6  | 162.3 | 31.3  | 23.1   | 2.6   | -6.6  | 5.4   | 14.9  | -1.0  | -12.1 | -35.2
|1993                                                                                                                              | -52.4 | -72.1 | -57.0 | -40.4 | -1.9   | -4.6  | 5.3   | -1.6  | 6.7   | -4.5  | -28.1 | 18.5 
|1994                                                                                                                              | 59.2  | 90.5  | 20.4  | 38.4  | -0.2   | 8.5   | 4.3   | 2.8   | -5.7  | 11.2  | 51.1  | 14.3 
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|1995                                                                                                                              | 11.1  | 63.9  | 73.5  | 23.8  | 16.9   | 12.3  | 7.6   | 2.0   | 11.1  | 8.8   | 12.2  | -0.1 
|1996                                                                                                                              | -39.1 | -35.6 | -43.5 | -43.8 | -39.1  | -20.3 | -19.2 | 9.7   | -12.4 | -23.3 | -28.3 | -24.4
|1997                                                                                                                              | 25.9  | 17.4  | -31.4 | -31.5 | 35.7   | 28.4  | 19.3  | -17.0 | 3.9   | 13.8  | 20.4  | 11.4 
|1998                                                                                                                              | 30.6  | 2.6   | 2.4   | -47.6 | -38.3  | -33.5 | -34.2 | 0.1   | -2.9  | -3.1  | 3.0   | 3.4  
|1999                                                                                                                              | -1.5  | 26.3  | 111.4 | 191.1 | -1.8   | -18.6 | 18.2  | 36.0  | 18.8  | 28.0  | 19.2  | 38.5 
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|2000                                                                                                                              | -21.7 | -25.1 | -31.9 | 12.7  | 47.7   | 69.3  | 48.1  | -13.3 | 3.3   | -7.0  | -27.6 | -7.1 
|2001                                                                                                                              | 42.2  | -9.5  | 7.2   | 30.5  | 90.5   | 33.2  | -1.1  | 13.2  | 3.1   | 5.9   | 37.1  | 18.5 
|2002                                                                                                                              | -15.0 | 2.8   | -2.5  | 19.3  | -18.1  | -0.7  | 5.6   | 4.2   | 2.0   | -2.7  | 5.5   | -1.7 
|2003                                                                                                                              | 34.8  | 2.5   | 32.0  | -21.1 | -7.7   | -9.9  | -8.5  | 1.9   | 6.1   | 9.6   | 0.8   | 4.7  
|2004                                                                                                                              | 8.9   | 60.4  | 61.6  | 95.9  | 49.0   | 22.4  | 8.4   | 1.7   | 4.5   | 2.2   | 5.8   | 10.9 
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|2005                                                                                                                              | -0.9  | 24.2  | 29.0  | 14.3  | 10.0   | 13.0  | 15.5  | 5.8   | 0.8   | 7.5   | 2.9   | 0.3  
|2006                                                                                                                              | 16.2  | -2.4  | -13.0 | -24.1 | -18.9  | -4.2  | -1.4  | 7.5   | 5.7   | -2.7  | -9.4  | -8.1 
|2007                                                                                                                              | -31.4 | -20.4 | -20.6 | -14.2 | -6.9   | -8.0  | 8.3   | -4.5  | 0.7   | 9.3   | 6.7   | 3.6  
|2008                                                                                                                              | -6.4  | -16.6 | -54.4 | -45.5 | -22.3  | -11.3 | 0.5   | 5.1   | 1.2   | 4.1   | 14.0  | -5.9 
|2009                                                                                                                              | 28.0  | 28.1  | 71.8  | 131.0 | 61.2   | 40.5  | 10.3  | 7.2   | 3.3   | 1.9   | 4.5   | 0.6  
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|2010                                                                                                                              | 18.1  | 21.7  | 31.4  | -8.8  | -0.5   | 3.8   | 0.3   | -1.4  | 1.8   | 2.9   | -11.2 | 10.1 
|2011                                                                                                                              | -4.0  | -20.8 | -19.7 | -42.1 | -38.5  | -33.2 | -24.9 | -6.0  | -2.4  | -2.7  | 11.6  | 10.8 
|2012                                                                                                                              | -4.5  | 8.5   | 42.1  | 92.3  | 54.4   | 42.9  | 28.3  | 6.4   | 3.0   | 1.8   | 1.9   | -3.7 
|2013                                                                                                                              | -16.4 | -6.2  | -20.5 | -37.0 | -33.5  | -27.5 | -13.2 | -2.3  | -2.3  | -1.6  | -7.7  | -13.2
|2014                                                                                                                              | 9.1   | -12.2 | -33.9 | -2.7  | 12.5   | 6.2   | -3.4  | 3.1   | 1.9   | 3.8   | 4.6   | 19.5 
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|2015                                                                                                                              | 24.1  | 45.9  | 69.7  | 40.0  | 19.0   | -7.0  | -16.5 | -10.4 | -3.2  | -0.6  | -10.8 | -20.6
|2016                                                                                                                              | -8.7  | -21.2 | -20.7 | -2.9  | -1.7   | 11.4  | 18.7  | 0.7   | 1.5   | -1.6  | 15.0  | 13.0 
|2017                                                                                                                              | -20.6 | -14.2 | -12.8 | -12.3 | -0.6   | 4.8   | -1.7  | -0.9  | 0.9   | -4.8  | -2.1  | -5.6 
|2018                                                                                                                              | 23.7  | 2.4   | -6.6  | -5.3  | -10.4  | 7.7   | -0.9  | 1.3   | -3.9  | 1.3   | -5.7  | 5.9  
|2019                                                                                                                              | -11.1 | -9.4  | 58.8  | 59.4  | 55.9   | 16.5  | 23.4  | 1.2   | 2.6   | -11.1 | -1.3  | 3.4  
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|2020                                                                                                                              | 26.8  | 23.2  | -15.7 | -8.6  | -5.0   | 1.6   | 3.0   | 10.4  | 2.4   | 8.1   | 2.3   | -3.6 
|2021                                                                                                                              | 3.9   | 16.8  | 2.6   | -24.2 | -1.0   | -3.1  | 4.4   | -3.9  | -3.8  | 5.8   | 9.0   | -6.8 
|2022                                                                                                                              | -0.2  | -5.6  | 13.1  | -24.5 | -35.3  | -12.6 | -6.7  | -7.3  | 1.5   | -3.4  | -16.5 | -16.0
|2023                                                                                                                              | -28.6 | -17.4 | -44.8 | 9.6   | 41.5   | 14.8  | -7.9  | 11.5  | -0.5  | -8.2  | 6.3   | 44.3 
|2024                                                                                                                              | 35.1  | 56.5  | 183.0 | 101.9 | 16.3   |       |       |       |       |       |       |      
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|- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
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|Release Date: 7/31/2024                                                                                                          
|Next Release Date: 8/30/2024