| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,348 | $14,337 |
| 2016 | $19,751 | $14,711 |
| 2017 | $20,476 | $15,651 |
| 2018 | $20,476 | $15,072 |
| 2019 | $21,668 | $14,983 |
| 2020 | $22,276 | $15,591 |
| 2021* | $22,902 | $15,998 |
| 2022* | $23,546 | $16,415 |
| 2023* | $24,207 | $16,844 |
| 2024* | $24,887 | $17,284 |
| 2025* | $25,587 | $17,735 |