| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,486 | $12,445 |
| 2016 | $22,905 | $17,263 |
| 2017 | $23,616 | $17,022 |
| 2018 | $23,616 | $17,978 |
| 2019 | $24,601 | $16,825 |
| 2020 | $24,909 | $17,133 |
| 2021* | $25,681 | $17,447 |
| 2022* | $26,477 | $17,766 |
| 2023* | $27,298 | $18,091 |
| 2024* | $28,144 | $18,422 |
| 2025* | $29,017 | $18,759 |