| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,920 | $18,894 |
| 2016 | $25,285 | $20,854 |
| 2017 | $21,853 | $17,532 |
| 2018 | $21,853 | $16,454 |
| 2019 | $23,915 | $17,868 |
| 2020 | $24,143 | $18,096 |
| 2021* | $24,372 | $18,328 |
| 2022* | $24,604 | $18,562 |
| 2023* | $24,838 | $18,800 |
| 2024* | $25,074 | $19,040 |
| 2025* | $25,312 | $19,284 |