| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,600 | $14,124 |
| 2016 | $18,290 | $14,661 |
| 2017 | $18,928 | $15,270 |
| 2018 | $18,928 | $14,911 |
| 2019 | $19,282 | $15,073 |
| 2020 | $19,536 | $15,327 |
| 2021* | $19,901 | $15,586 |
| 2022* | $20,273 | $15,849 |
| 2023* | $20,653 | $16,117 |
| 2024* | $21,039 | $16,390 |
| 2025* | $21,432 | $16,667 |