| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,879 | $15,466 |
| 2016 | $20,415 | $15,954 |
| 2017 | $21,417 | $17,105 |
| 2018 | $21,417 | $16,777 |
| 2019 | $23,604 | $18,378 |
| 2020 | $24,498 | $19,272 |
| 2021* | $25,426 | $20,209 |
| 2022* | $26,390 | $21,191 |
| 2023* | $27,390 | $22,221 |
| 2024* | $28,428 | $23,301 |
| 2025* | $29,506 | $24,433 |