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| Oklahoma, Kansas, Missouri Refinery District Sulfur Content (Weighted Average) of Crude Oil Input to Refineries (Percent) | ||||||||
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1985 | 0.44 | 0.48 | 0.53 | 0.45 | 0.43 | 0.46 | 0.47 | 0.48 | 0.50 | 0.49 | 0.51 | 0.55 |
| 1986 | 0.49 | 0.53 | 0.45 | 0.46 | 0.48 | 0.50 | 0.55 | 0.54 | 0.52 | 0.54 | 0.58 | 0.54 |
| 1987 | 0.59 | 0.55 | 0.60 | 0.56 | 0.57 | 0.51 | 0.54 | 0.52 | 0.52 | 0.49 | 0.53 | 0.52 |
| 1988 | 0.54 | 0.54 | 0.56 | 0.53 | 0.54 | 0.51 | 0.56 | 0.58 | 0.59 | 0.60 | 0.58 | 0.57 |
| 1989 | 0.70 | 0.60 | 0.65 | 0.68 | 0.65 | 0.64 | 0.60 | 0.60 | 0.61 | 0.57 | 0.58 | 0.64 |
| 1990 | 0.66 | 0.72 | 0.66 | 0.64 | 0.62 | 0.61 | 0.66 | 0.61 | 0.60 | 0.68 | 0.66 | 0.64 |
| 1991 | 0.63 | 0.65 | 0.71 | 0.64 | 0.67 | 0.68 | 0.66 | 0.66 | 0.62 | 0.70 | 0.69 | 0.66 |
| 1992 | 0.61 | 0.67 | 0.65 | 0.62 | 0.68 | 0.71 | 0.66 | 0.65 | 0.66 | 0.68 | 0.71 | 0.70 |
| 1993 | 0.68 | 0.70 | 0.68 | 0.73 | 0.72 | 0.70 | 0.70 | 0.66 | 0.60 | 0.71 | 0.73 | 0.72 |
| 1994 | 0.64 | 0.71 | 0.74 | 0.70 | 0.75 | 0.76 | 0.77 | 0.78 | 0.77 | 0.69 | 0.70 | 0.65 |
| 1995 | 0.60 | 0.66 | 0.64 | 0.64 | 0.70 | 0.73 | 0.62 | 0.67 | 0.73 | 0.71 | 0.78 | 0.77 |
| 1996 | 0.70 | 0.72 | 0.69 | 0.66 | 0.71 | 0.70 | 0.72 | 0.70 | 0.72 | 0.69 | 0.66 | 0.72 |
| 1997 | 0.70 | 0.73 | 0.78 | 0.78 | 0.71 | 0.72 | 1.46 | 0.73 | 0.82 | 0.71 | 0.72 | 0.68 |
| 1998 | 0.84 | 0.92 | 0.85 | 0.81 | 0.82 | 0.81 | 0.80 | 0.75 | 0.70 | 0.73 | 0.75 | 0.78 |
| 1999 | 0.73 | 0.80 | 0.78 | 0.71 | 0.76 | 0.76 | 0.74 | 0.76 | 0.74 | 0.72 | 0.77 | 0.78 |
| 2000 | 0.82 | 0.82 | 0.78 | 0.75 | 0.84 | 0.84 | 0.88 | 0.82 | 0.79 | 0.79 | 0.79 | 0.77 |
| 2001 | 0.78 | 0.81 | 0.81 | 0.85 | 0.89 | 0.90 | 0.88 | 0.82 | 0.93 | 0.94 | 0.92 | 0.88 |
| 2002 | 0.85 | 0.93 | 0.81 | 0.81 | 0.83 | 0.85 | 0.76 | 0.83 | 0.88 | 0.82 | 0.79 | 0.84 |
| 2003 | 0.90 | 0.88 | 0.80 | 0.89 | 0.89 | 0.87 | 0.93 | 0.89 | 0.82 | 0.83 | 0.82 | 0.85 |
| 2004 | 0.82 | 0.83 | 0.87 | 0.88 | 0.84 | 0.85 | 0.86 | 0.81 | 0.91 | 0.80 | 0.91 | 0.93 |
| 2005 | 0.93 | 0.98 | 0.88 | 0.84 | 0.92 | 0.92 | 0.93 | 0.93 | 0.92 | 0.88 | 0.86 | 0.85 |
| 2006 | 0.89 | 0.98 | 0.91 | 1.03 | 1.02 | 1.04 | 0.94 | 0.96 | 1.00 | 0.97 | 1.00 | 0.97 |
| 2007 | 0.97 | 1.03 | 0.92 | 0.91 | 1.47 | 1.13 | 1.04 | 1.03 | 1.08 | 1.08 | 1.04 | 1.25 |
| 2008 | 1.08 | 1.05 | 0.77 | 0.93 | 0.94 | 0.97 | 0.95 | 0.87 | 1.04 | 1.02 | 1.07 | 1.03 |
| 2009 | 1.04 | 0.97 | 1.01 | 0.92 | 0.96 | 0.85 | 0.95 | 0.95 | 0.87 | 0.93 | 1.02 | 0.94 |
| 2010 | 0.90 | 0.97 | 1.02 | 0.97 | 1.00 | 0.95 | 0.90 | 0.88 | 1.00 | 0.97 | 0.94 | 0.81 |
| 2011 | 0.82 | 0.91 | 0.94 | 0.87 | 0.96 | 0.93 | 0.90 | 0.90 | 0.85 | 0.80 | 0.75 | 0.88 |
| 2012 | 0.89 | 1.01 | 0.88 | 0.90 | 0.86 | 0.93 | 0.90 | 0.92 | 0.89 | 0.95 | 0.98 | 0.89 |
| 2013 | 0.91 | 0.86 | 0.84 | 0.89 | 0.89 | 0.92 | 0.82 | 0.87 | 0.85 | 0.93 | 0.86 | 0.89 |
| 2014 | 0.81 | 0.80 | 0.80 | 0.79 | 0.79 | 0.74 | 0.74 | 0.67 | 0.73 | 0.69 | 0.71 | 0.65 |
| 2015 | 0.77 | 0.84 | 0.75 | 0.74 | 0.76 | 0.66 | 0.66 | 0.65 | 0.71 | 0.69 | 0.71 | 0.72 |
| 2016 | 0.87 | 0.85 | 0.86 | 0.88 | 0.80 | 0.92 | 0.97 | 0.80 | 0.85 | 0.95 | 0.91 | 0.89 |
| 2017 | 0.90 | 0.91 | 0.82 | 0.89 | 0.79 | 0.81 | 0.78 | 0.84 | 0.82 | 0.85 | 0.77 | 0.75 |
| 2018 | 0.81 | 0.89 | 0.88 | 0.84 | 0.80 | 0.78 | 0.72 | 0.74 | 0.74 | 0.61 | 0.69 | 0.73 |
| 2019 | 0.65 | 0.71 | 0.56 | 0.54 | 0.63 | 0.64 | 0.66 | 0.64 | 0.62 | 0.59 | 0.60 | 0.68 |
| 2020 | 0.67 | 0.68 | 0.70 | 0.73 | 0.74 | 0.55 | 0.68 | 0.60 | 0.57 | 0.59 | 0.60 | 0.61 |
| 2021 | 0.63 | 0.74 | 0.68 | 0.67 | 0.62 | 0.59 | 0.59 | 0.62 | 0.66 | 0.68 | 0.64 | 0.69 |
| 2022 | 0.68 | 0.66 | 0.71 | 0.73 | 0.65 | 0.70 | 0.58 | 0.74 | 0.66 | 0.59 | 0.58 | 0.62 |
| 2023 | 0.58 | 0.55 | 0.48 | 0.52 | 0.64 | 0.57 | 0.58 | 0.70 | 0.66 | 0.69 | 0.65 | 0.67 |
| 2024 | 0.70 | 0.72 | 0.68 | 0.66 | 0.67 | 0.60 | 0.66 | 0.69 | 0.68 | 0.55 | 0.52 | 0.61 |
| 2025 | 0.64 | 0.72 | 0.67 | 0.59 | 0.74 | 0.63 | 0.63 | 0.63 | ||||
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 10/31/2025 |
| Next Release Date: 11/28/2025 |