| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,202 | $16,776 |
| 2016 | $23,508 | $17,412 |
| 2017 | $23,877 | $19,134 |
| 2018 | $23,877 | $18,273 |
| 2019 | $24,489 | $19,900 |
| 2020 | $26,809 | $22,220 |
| 2021* | $27,230 | $24,198 |
| 2022* | $27,657 | $26,351 |
| 2023* | $28,092 | $28,696 |
| 2024* | $28,533 | $31,250 |
| 2025* | $28,981 | $34,032 |