| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $36,716 | $33,092 |
| 2016 | $36,650 | $28,689 |
| 2017 | $36,902 | $27,225 |
| 2018 | $36,902 | N/A |
| 2019 | $37,509 | $27,026 |
| 2020 | $38,182 | $27,699 |
| 2021* | $38,445 | $26,286 |
| 2022* | $38,711 | $24,946 |
| 2023* | $38,978 | $23,674 |
| 2024* | $39,247 | $22,466 |
| 2025* | $39,518 | $21,320 |