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| Indiana, Illinois, Kentucky Refinery District API Gravity (Weighted Average) of Crude Oil Input to Refineries (Degree) | ||||||||
| Decade | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1980's | 35.59 | 35.10 | 35.33 | 34.91 | 34.66 | |||||
| 1990's | 34.45 | 34.22 | 33.85 | 33.56 | 34.38 | 34.08 | 34.00 | 33.32 | 33.05 | 33.28 |
| 2000's | 32.99 | 32.91 | 32.98 | 32.54 | 31.80 | 32.06 | 32.20 | 32.62 | 32.79 | 32.96 |
| 2010's | 33.50 | 33.10 | 32.74 | 32.50 | 31.77 | 32.13 | 31.55 | 32.19 | 32.55 | 33.07 |
| 2020's | 33.11 | 32.95 | 32.96 | 33.26 | 33.66 | 33.42 |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 3/6/2026 |
| Next Release Date: 8/31/2026 |