| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,792 | $17,113 |
| 2016 | $23,664 | $17,820 |
| 2017 | $23,708 | $17,969 |
| 2018 | $23,708 | $18,034 |
| 2019 | $24,758 | $17,940 |
| 2020 | $25,731 | $18,913 |
| 2021* | $26,716 | $19,072 |
| 2022* | $27,740 | $19,232 |
| 2023* | $28,802 | $19,394 |
| 2024* | $29,905 | $19,557 |
| 2025* | $31,051 | $19,721 |