| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $27,811 | $18,342 |
| 2016 | $26,520 | $16,817 |
| 2017 | $27,142 | $16,637 |
| 2018 | $27,142 | $16,457 |
| 2019 | $28,658 | $18,070 |
| 2020 | $29,205 | $18,617 |
| 2021* | $29,763 | $18,418 |
| 2022* | $30,331 | $18,221 |
| 2023* | $30,911 | $18,026 |
| 2024* | $31,501 | $17,833 |
| 2025* | $32,103 | $17,642 |