|                                                                              
|------------------------------------------------------------------------------
|                                                                              
|View History:  Monthly  Annual Download Data (XLS File)                      
|View History:  Monthly  Annual                                                
|View History:  Monthly  Annual                                                
|View History:                                                                 
|                                                                              
|Illinois Natural Gas Injections into Underground Storage  (Million Cubic Feet)
|                                                                              
|                                                                              
|Illinois Natural Gas Injections into Underground Storage  (Million Cubic Feet)
|                                                                              

|Decade                                                                                                                            | Year-0  | Year-1  | Year-2  | Year-3  | Year-4  | Year-5  | Year-6  | Year-7  | Year-8  | Year-9 
|--------------------------------------------------------------------------------------------------------------------------------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | -------
|1960's                                                                                                                            |         |         |         |         |         |         |         | 119,125 | 143,180 | 153,497
|1970's                                                                                                                            | 190,661 | 214,871 | 237,098 | 233,112 | 232,284 | 294,689 | 235,310 | 293,311 | 236,669 | 253,320
|1980's                                                                                                                            | 197,385 | 141,824 | 217,536 | 122,620 | 194,327 | 165,688 | 156,754 | 125,066 | 166,713 | 199,165
|1990's                                                                                                                            | 213,076 | 212,232 | 214,404 | 240,515 | 235,778 | 263,409 | 241,129 | 227,785 | 225,089 | 238,325
|2000's                                                                                                                            | 225,524 | 231,097 | 246,574 | 249,228 | 246,747 | 260,515 | 242,754 | 243,789 | 260,333 | 259,421
|2010's                                                                                                                            | 247,458 | 258,690 | 249,953 | 265,175 | 270,831 | 247,839 | 241,587 | 235,564 | 248,114 | 256,390
|2020's                                                                                                                            | 240,000 | 230,330 | 238,039 | 236,501 |         |         |         |         |         |        
|- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
|                                                                                                                                 
|Release Date: 5/31/2024                                                                                                          
|Next Release Date: 6/28/2024