| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,300 | $14,113 |
| 2016 | $19,560 | $16,004 |
| 2017 | $19,654 | $15,854 |
| 2018 | $19,654 | $17,271 |
| 2019 | $20,278 | $18,270 |
| 2020 | $19,471 | $17,463 |
| 2021* | $19,564 | $18,472 |
| 2022* | $19,658 | $19,540 |
| 2023* | $19,753 | $20,669 |
| 2024* | $19,848 | $21,864 |
| 2025* | $19,943 | $23,128 |