| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,488 | $13,277 |
| 2016 | $17,398 | $10,558 |
| 2017 | $19,129 | $12,205 |
| 2018 | $19,129 | $13,019 |
| 2019 | $19,634 | $12,937 |
| 2020 | $20,870 | $14,173 |
| 2021* | $21,421 | $15,118 |
| 2022* | $21,986 | $16,127 |
| 2023* | $22,567 | $17,202 |
| 2024* | $23,163 | $18,350 |
| 2025* | $23,774 | $19,574 |