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|View History:  Monthly  Annual Download Data (XLS File)                                      
|View History:  Monthly  Annual                                                                
|View History:  Monthly  Annual                                                                
|View History:                                                                                 
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|Percent of Commercial Natural Gas Deliveries in Washington Represented by the Price  (Percent)
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|Percent of Commercial Natural Gas Deliveries in Washington Represented by the Price  (Percent)
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|Year                                                                                                                              | Jan  | Feb  | Mar  | Apr  | May  | Jun  | Jul  | Aug  | Sep  | Oct  | Nov  | Dec 
|--------------------------------------------------------------------------------------------------------------------------------- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ----
|1989                                                                                                                              | 95.5 | 94.8 | 96.9 | 93.2 | 93.0 | 89.7 | 87.0 | 92.6 | 87.3 | 93.0 | 93.6 | 96.5
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|1990                                                                                                                              | 96.2 | 95.9 | 93.2 | 92.1 | 90.9 | 88.9 | 88.3 | 88.4 | 90.1 | 91.7 | 95.7 | 96.5
|1991                                                                                                                              | 97.8 | 94.9 | 94.3 | 93.2 | 91.2 | 90.5 | 88.3 | 87.2 | 85.6 | 85.2 | 88.7 | 92.1
|1992                                                                                                                              | 92.1 | 89.0 | 88.7 | 85.5 | 83.5 | 80.7 | 78.5 | 80.3 | 81.6 | 83.4 | 86.8 | 92.3
|1993                                                                                                                              | 93.8 | 93.2 | 93.9 | 93.6 | 90.8 | 89.8 | 90.5 | 90.4 | 90.6 | 94.8 | 97.4 | 98.0
|1994                                                                                                                              | 97.6 | 97.6 | 97.6 | 97.4 | 92.1 | 92.1 | 92.4 | 91.7 | 94.4 | 93.8 | 94.1 | 94.7
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|1995                                                                                                                              | 94.3 | 94.0 | 94.2 | 92.6 | 91.8 | 91.3 | 90.8 | 90.7 | 87.4 | 87.9 | 88.7 | 89.7
|1996                                                                                                                              | 89.1 | 89.8 | 87.6 | 84.4 | 84.4 | 82.0 | 80.0 | 80.1 | 81.5 | 82.7 | 84.6 | 87.4
|1997                                                                                                                              | 92.4 | 91.7 | 91.2 | 89.3 | 87.7 | 87.0 | 86.2 | 87.7 | 78.8 | 90.6 | 54.4 | 93.5
|1998                                                                                                                              | 93.0 | 87.0 | 88.7 | 84.1 | 80.7 | 80.4 | 82.1 | 84.0 | 86.0 | 85.8 | 85.0 | 88.3
|1999                                                                                                                              | 91.5 | 90.3 | 90.5 | 88.0 | 87.3 | 83.9 | 83.5 | 83.8 | 87.9 | 90.7 | 89.7 | 91.4
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|2000                                                                                                                              | 96.0 | 95.5 | 96.0 | 94.7 | 93.0 | 92.0 | 92.1 | 91.5 | 91.9 | 93.6 | 76.8 | 95.4
|2001                                                                                                                              | 95.1 | 94.8 | 94.8 | 96.0 | 90.0 | 91.6 | 89.9 | 87.4 | 88.3 | 93.8 | 93.5 | 97.3
|2002                                                                                                                              | 77.8 | 95.0 | 94.9 | 94.0 | 94.0 | 92.4 | 86.3 | 84.4 | 84.0 | 87.5 | 91.5 | 92.0
|2003                                                                                                                              | 89.4 | 89.7 | 89.7 | 88.6 | 85.9 | 83.8 | 82.6 | 82.2 | 83.6 | 85.3 | 89.9 | 90.5
|2004                                                                                                                              | 91.7 | 89.8 | 89.8 | 86.2 | 84.7 | 84.4 | 83.2 | 82.5 | 85.9 | 86.5 | 89.9 | 91.6
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|2005                                                                                                                              | 91.4 | 89.4 | 89.7 | 88.7 | 84.8 | 84.6 | 83.1 | 83.4 | 84.9 | 87.4 | 90.4 | 91.9
|2006                                                                                                                              | 89.5 | 91.1 | 91.0 | 87.3 | 85.7 | 84.0 | 83.4 | 84.2 | 84.7 | 88.9 | 90.7 | 91.8
|2007                                                                                                                              | 91.8 | 89.7 | 90.3 | 88.0 | 86.1 | 84.5 | 83.8 | 84.4 | 85.3 | 89.4 | 90.8 | 91.9
|2008                                                                                                                              | 91.2 | 90.3 | 89.8 | 88.8 | 86.3 | 85.8 | 83.6 | 84.1 | 84.8 | 88.5 | 92.2 | 90.6
|2009                                                                                                                              | 90.9 | 90.1 | 91.1 | 86.6 | 85.5 | 83.1 | 82.1 | 82.2 | 83.4 | 88.4 | 89.1 | 92.1
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|2010                                                                                                                              | 88.9 | 89.3 | 89.1 | 87.3 | 85.7 | 84.2 | 82.3 | 83.0 | 84.2 | 86.7 | 89.8 | 90.8
|2011                                                                                                                              | 90.4 | 89.8 | 89.8 | 87.9 | 86.0 | 84.4 | 82.7 | 83.0 | 82.8 | 87.9 | 90.4 | 90.9
|2012                                                                                                                              | 91.3 | 89.9 | 90.3 | 86.5 | 84.9 | 82.9 | 80.7 | 80.5 | 79.2 | 85.3 | 88.6 | 89.7
|2013                                                                                                                              | 90.7 | 88.2 | 88.8 | 87.1 | 84.9 | 79.0 | 80.2 | 84.4 | 81.3 | 84.2 | 86.4 | 90.6
|2014                                                                                                                              | 87.8 | 88.8 | 87.4 | 84.6 | 81.6 | 80.9 | 80.7 | 79.1 | 82.0 | 83.7 | 88.3 | 89.1
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|2015                                                                                                                              | 88.1 | 86.2 | 86.2 | 85.0 | 81.0 | 78.4 | 78.8 | 77.1 | 81.1 | 82.7 | 88.3 | 89.2
|2016                                                                                                                              | 88.7 | 86.4 | 87.2 | 81.1 | 81.0 | 79.2 | 80.8 | 78.1 | 81.0 | 85.1 | 86.2 | 90.1
|2017                                                                                                                              | 89.4 | 87.9 | 87.5 | 85.9 | 82.3 | 79.1 | 79.8 | 78.0 | 81.5 | 86.2 | 88.3 | 89.7
|2018                                                                                                                              | 88.2 | 84.4 | 87.7 | 84.2 | 80.1 | 82.0 | 77.2 | 76.7 | 82.5 | 86.5 | 88.5 | 89.8
|2019                                                                                                                              | 88.0 | 89.9 | 87.5 | 82.1 | 82.2 | 80.1 | 80.4 | 75.9 | 81.2 | 88.0 | 88.0 | 90.3
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|2020                                                                                                                              | 90.4 | 84.5 | 88.7 | 83.6 | 82.5 | 82.1 | 77.8 | 79.7 | 80.3 | 86.9 | 89.2 | 89.7
|2021                                                                                                                              | 89.2 | 90.2 | 87.8 | 84.4 | 82.2 | 78.9 | 80.4 | 75.9 | 84.0 | 84.7 | 89.1 | 90.2
|2022                                                                                                                              | 90.4 | 88.6 | 86.8 | 87.1 | 84.5 | 83.1 | 83.3 | 75.7 | 79.4 | 84.0 | 89.8 | 90.2
|2023                                                                                                                              | 91.1 | 91.6 | 88.7 | 84.2 | 86.2 | 87.1 | 78.0 | 78.7 | 81.6 | 85.1 | 89.6 | 89.8
|2024                                                                                                                              | 90.9 | 89.7 | 89.3 | 87.3 | 84.8 |      |      |      |      |      |      |     
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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