| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,309 | $16,734 |
| 2016 | $25,341 | $16,557 |
| 2017 | $26,118 | $17,009 |
| 2018 | $26,118 | $16,642 |
| 2019 | $28,544 | $18,390 |
| 2020 | $28,974 | $18,820 |
| 2021* | $29,864 | $19,260 |
| 2022* | $30,780 | $19,711 |
| 2023* | $31,725 | $20,172 |
| 2024* | $32,699 | $20,644 |
| 2025* | $33,703 | $21,127 |