| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,202 | $18,010 |
| 2016 | $23,508 | $17,439 |
| 2017 | $23,877 | $19,698 |
| 2018 | $23,877 | $18,447 |
| 2019 | $24,489 | $20,017 |
| 2020 | $26,686 | $22,214 |
| 2021* | $27,105 | $24,104 |
| 2022* | $27,531 | $26,156 |
| 2023* | $27,963 | $28,382 |
| 2024* | $28,402 | $30,797 |
| 2025* | $28,848 | $33,418 |