| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,122 | $13,100 |
| 2016 | $17,510 | $13,394 |
| 2017 | $17,831 | $13,619 |
| 2018 | $17,831 | $13,042 |
| 2019 | $18,736 | $13,493 |
| 2020 | $19,364 | $14,121 |
| 2021* | $19,804 | $14,437 |
| 2022* | $20,253 | $14,761 |
| 2023* | $20,713 | $15,091 |
| 2024* | $21,183 | $15,429 |
| 2025* | $21,664 | $15,775 |