| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,938 | $16,488 |
| 2016 | $23,429 | $17,204 |
| 2017 | $23,981 | $18,383 |
| 2018 | $23,981 | $17,771 |
| 2019 | $25,055 | $18,246 |
| 2020 | $25,355 | $18,546 |
| 2021* | $25,953 | $19,041 |
| 2022* | $26,566 | $19,550 |
| 2023* | $27,193 | $20,072 |
| 2024* | $27,835 | $20,607 |
| 2025* | $28,491 | $21,158 |