|                                                                                                               
|---------------------------------------------------------------------------------------------------------------
|                                                                                                               
|View History: Annual Download Data (XLS File)                                                                 
|View History: Annual                                                                                           
|View History: Annual                                                                                           
|View History:                                                                                                  
|                                                                                                               
|Montana Nonassociated Natural Gas, Wet After Lease Separation, Reserves Revision Decreases (Billion Cubic Feet)
|                                                                                                               
|                                                                                                               
|Montana Nonassociated Natural Gas, Wet After Lease Separation, Reserves Revision Decreases (Billion Cubic Feet)
|                                                                                                               

|Decade                                                                                                                            | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9
|--------------------------------------------------------------------------------------------------------------------------------- | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------
|1970's                                                                                                                            |        |        |        |        |        |        |        |        |        | 80    
|1980's                                                                                                                            | 179    | 63     | 83     | 63     | 61     | 33     | 22     | 8      | 25     | 16    
|1990's                                                                                                                            | 25     | 30     | 13     | 6      | 71     | 11     | 11     | 130    | 37     | 28    
|2000's                                                                                                                            | 125    | 82     | 96     | 23     | 113    | 109    | 60     | 43     | 40     | 148   
|2010's                                                                                                                            | 70     | 65     | 175    | 8      | 7      | 7      | 9      | 4      | 5      | 37    
|2020's                                                                                                                            | 1      | 14     |        |        |        |        |        |        |        |       
|- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
|                                                                                                                                 
|Release Date: 12/30/2022                                                                                                         
|Next Release Date: 12/29/2023