| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,315 | $18,001 |
| 2016 | $25,587 | $19,479 |
| 2017 | $26,484 | $20,443 |
| 2018 | $26,484 | $20,536 |
| 2019 | $27,374 | $21,801 |
| 2020 | $27,595 | $22,022 |
| 2021* | $28,522 | $23,112 |
| 2022* | $29,481 | $24,256 |
| 2023* | $30,471 | $25,457 |
| 2024* | $31,495 | $26,717 |
| 2025* | $32,553 | $28,039 |