| O & M | I & S | TOTAL RATE | |
| 2022 | 0.3174 | 0.1598 | 0.4772 |
| 2021 | 0.3270 | 0.2000 | 0.5270 |
| 2020 | 0.3217 | 0.1843 | 0.5060 |
| 2019 | 0.2930 | 0.1780 | 0.4710 |
| 2018 | 0.2561 | 0.1989 | 0.4550 |
| 2017 | 0.2467 | 0.1993 | 0.4460 |
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