| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,250 | $16,632 |
| 2016 | $26,026 | $17,231 |
| 2017 | $26,450 | $16,963 |
| 2018 | $26,450 | $16,861 |
| 2019 | $28,898 | $18,068 |
| 2020 | $29,678 | $18,848 |
| 2021* | $30,479 | $19,527 |
| 2022* | $31,302 | $20,229 |
| 2023* | $32,147 | $20,958 |
| 2024* | $33,015 | $21,712 |
| 2025* | $33,907 | $22,494 |