| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $26,518 | $22,565 |
| 2016 | $27,008 | $21,937 |
| 2017 | $27,288 | $19,920 |
| 2018 | $27,288 | $21,048 |
| 2019 | $28,208 | $21,506 |
| 2020 | $28,678 | $21,976 |
| 2021* | $29,157 | $22,455 |
| 2022* | $29,644 | $22,945 |
| 2023* | $30,139 | $23,445 |
| 2024* | $30,642 | $23,956 |
| 2025* | $31,154 | $24,478 |