| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,804 | $13,206 |
| 2016 | $21,730 | $13,758 |
| 2017 | $22,472 | $14,364 |
| 2018 | $22,472 | $13,508 |
| 2019 | $23,738 | $14,082 |
| 2020 | $24,124 | $14,468 |
| 2021* | $24,947 | $15,073 |
| 2022* | $25,797 | $15,703 |
| 2023* | $26,677 | $16,359 |
| 2024* | $27,587 | $17,043 |
| 2025* | $28,527 | $17,755 |