| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,362 | $21,181 |
| 2016 | $26,308 | $23,102 |
| 2017 | $27,285 | $23,895 |
| 2018 | $27,285 | $20,654 |
| 2019 | $27,779 | $20,958 |
| 2020 | $28,523 | $21,702 |
| 2021* | $29,287 | $22,446 |
| 2022* | $30,072 | $23,216 |
| 2023* | $30,878 | $24,013 |
| 2024* | $31,706 | $24,836 |
| 2025* | $32,556 | $25,688 |