| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,190 | $16,995 |
| 2016 | $26,316 | $18,972 |
| 2017 | $26,726 | $20,065 |
| 2018 | $26,726 | $18,836 |
| 2019 | $27,353 | $19,471 |
| 2020 | $28,968 | $21,086 |
| 2021* | $29,649 | $22,301 |
| 2022* | $30,345 | $23,585 |
| 2023* | $31,059 | $24,944 |
| 2024* | $31,788 | $26,380 |
| 2025* | $32,536 | $27,900 |