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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 Michigan Represented by the Price  (Percent)
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|Percent of Commercial Natural Gas Deliveries in Michigan Represented by the Price  (Percent)
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|Year                                                                                                                              | Jan   | Feb   | Mar   | Apr   | May   | Jun   | Jul   | Aug   | Sep   | Oct   | Nov   | Dec  
|--------------------------------------------------------------------------------------------------------------------------------- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | -----
|1989                                                                                                                              | 75.8  | 74.5  | 76.0  | 71.7  | 64.9  | 47.6  | 51.7  | 50.8  | 57.5  | 64.4  | 69.5  | 73.5 
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|1990                                                                                                                              | 73.1  | 74.0  | 74.5  | 72.3  | 67.4  | 58.1  | 49.6  | 51.5  | 52.2  | 62.1  | 70.1  | 74.6 
|1991                                                                                                                              | 73.0  | 72.2  | 72.4  | 67.3  | 62.1  | 51.2  | 44.3  | 41.2  | 47.5  | 60.1  | 87.2  | 70.0 
|1992                                                                                                                              | 73.7  | 74.5  | 71.4  | 70.5  | 66.6  | 55.5  | 48.5  | 51.6  | 49.9  | 61.1  | 68.6  | 73.1 
|1993                                                                                                                              | 74.5  | 72.3  | 72.6  | 68.0  | 63.7  | 51.6  | 50.5  | 54.4  | 50.9  | 63.1  | 68.1  | 73.1 
|1994                                                                                                                              | 73.7  | 71.6  | 70.8  | 66.3  | 60.1  | 45.7  | 41.7  | 42.3  | 45.4  | 55.4  | 63.4  | 69.8 
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|1995                                                                                                                              | 72.5  | 72.2  | 71.2  | 68.0  | 61.5  | 45.8  | 41.6  | 39.0  | 46.9  | 57.1  | 68.0  | 72.5 
|1996                                                                                                                              | 73.7  | 72.1  | 73.1  | 68.5  | 64.4  | 46.1  | 44.2  | 41.3  | 44.6  | 55.8  | 67.2  | 70.2 
|1997                                                                                                                              | 70.0  | 70.2  | 67.3  | 66.2  | 58.6  | 45.7  | 55.7  | 40.7  | 39.7  | 54.2  | 64.8  | 65.7 
|1998                                                                                                                              | 70.8  | 66.5  | 65.7  | 60.1  | 44.3  | 42.3  | 39.6  | 37.5  | 42.5  | 47.8  | 57.9  | 64.7 
|1999                                                                                                                              | 66.3  | 63.4  | 62.2  | 56.6  | 45.3  | 37.5  | 35.3  | 29.7  | 38.0  | 46.7  | 54.7  | 61.6 
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|2000                                                                                                                              | 63.1  | 63.9  | 61.5  | 56.5  | 51.3  | 42.1  | 37.1  | 41.6  | 43.4  | 51.0  | 60.2  | 68.0 
|2001                                                                                                                              | 68.6  | 69.0  | 68.4  | 62.8  | 58.0  | 48.5  | 41.8  | 40.4  | 49.4  | 57.4  | 61.9  | 68.4 
|2002                                                                                                                              | 67.9  | 68.1  | 75.6  | 64.9  | 57.4  | 53.8  | 44.4  | 42.4  | 42.0  | 52.8  | 60.9  | 64.1 
|2003                                                                                                                              | 67.9  | 68.0  | 66.2  | 65.4  | 59.6  | 50.1  | 45.2  | 49.0  | 45.9  | 58.3  | 66.1  | 69.8 
|2004                                                                                                                              | 71.1  | 72.0  | 66.0  | 65.2  | 55.4  | 51.7  | 44.6  | 47.9  | 48.0  | 58.8  | 66.7  | 70.8 
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|2005                                                                                                                              | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0
|2006                                                                                                                              | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0
|2007                                                                                                                              | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0
|2008                                                                                                                              | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0
|2009                                                                                                                              | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0
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|2010                                                                                                                              | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0
|2011                                                                                                                              | 60.3  | 60.2  | 58.8  | 55.9  | 52.2  | 41.2  | 35.9  | 34.0  | 37.0  | 43.9  | 50.8  | 55.5 
|2012                                                                                                                              | 57.4  | 58.0  | 52.8  | 48.9  | 42.5  | 36.9  | 32.3  | 30.3  | 38.9  | 45.3  | 52.1  | 57.3 
|2013                                                                                                                              | 56.7  | 59.5  | 58.3  | 51.9  | 45.5  | 38.8  | 33.3  | 31.8  | 38.5  | 43.8  | 56.7  | 57.7 
|2014                                                                                                                              | 59.4  | 58.8  | 59.8  | 55.1  | 47.4  | 41.8  | 36.7  | 39.5  | 38.8  | 46.3  | 58.0  | 59.1 
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|2015                                                                                                                              | 60.5  | 63.7  | 60.1  | 53.1  | 49.5  | 41.0  | 36.8  | 37.9  | 36.7  | 48.7  | 54.5  | 56.8 
|2016                                                                                                                              | 61.2  | 59.9  | 57.6  | 56.5  | 47.1  | 39.2  | 38.5  | 32.7  | 38.7  | 48.8  | 54.8  | 60.9 
|2017                                                                                                                              | 62.7  | 59.6  | 58.3  | 58.3  | 45.8  | 38.4  | 36.8  | 36.2  | 38.9  | 52.8  | 58.6  | 63.0 
|2018                                                                                                                              | 63.3  | 61.4  | 60.5  | 62.0  | 41.6  | 39.4  | 37.6  | 37.1  | 42.6  | 48.7  | 61.1  | 61.4 
|2019                                                                                                                              | 65.8  | 63.0  | 62.8  | 57.4  | 47.2  | 43.2  | 36.0  | 33.7  | 40.1  | 50.9  | 62.3  | 61.7 
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|2020                                                                                                                              | 63.2  | 63.7  | 61.0  | 56.9  | 49.5  | 41.9  | 40.3  | 34.3  | 42.1  | 52.8  | 59.0  | 64.4 
|2021                                                                                                                              | 63.8  | 64.9  | 60.1  | 54.9  | 52.2  | 40.1  | 37.7  | 39.7  | 38.0  | 48.1  | 61.5  | 64.6 
|2022                                                                                                                              | 67.7  | 66.9  | 64.7  | 63.3  | 48.4  | 45.3  | 43.6  | 39.5  | 44.5  | 56.2  | 62.5  | 69.0 
|2023                                                                                                                              | 66.3  | 66.9  | 66.8  | 58.9  | 53.5  | 45.9  | 45.3  | 40.4  | 44.3  | 58.3  | 65.9  | 64.4 
|2024                                                                                                                              | 69.5  | 65.3  | 65.8  | 61.4  | 46.5  |       |       |       |       |       |       |      
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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