| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,332 | $16,068 |
| 2016 | $24,684 | $17,108 |
| 2017 | $25,208 | $17,138 |
| 2018 | $25,208 | $16,676 |
| 2019 | $27,518 | $18,466 |
| 2020 | $25,922 | $16,870 |
| 2021* | $26,472 | $16,900 |
| 2022* | $27,033 | $16,931 |
| 2023* | $27,606 | $16,961 |
| 2024* | $28,191 | $16,992 |
| 2025* | $28,789 | $17,022 |