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| Illinois Natural Gas % of Total Vehicle Fuel Deliveries (Percent) | |||||
| Decade | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1990's | 1.26 | 1.66 | 1.15 | 1.07 | 2.32 | 2.18 | 2.19 | |||
| 2000's | 2.18 | 2.02 | 2.00 | 1.99 | 1.99 | 1.39 | 1.14 | 0.99 | 0.90 | 0.87 |
| 2010's | 1.03 | 0.87 | 0.87 | 0.96 | 1.15 | 1.00 | 1.13 | 0.39 | 0.27 | 0.24 |
| 2020's | 0.20 | 0.13 | 0.12 | 0.29 | 0.28 |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 11/28/2025 |
| Next Release Date: 12/31/2025 |