| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,304 | $13,007 |
| 2016 | $17,756 | $14,049 |
| 2017 | $18,348 | $13,588 |
| 2018 | $18,348 | $12,952 |
| 2019 | $19,776 | $13,567 |
| 2020 | $20,700 | $14,491 |
| 2021* | $21,389 | $15,179 |
| 2022* | $22,102 | $15,900 |
| 2023* | $22,838 | $16,656 |
| 2024* | $23,598 | $17,447 |
| 2025* | $24,384 | $18,275 |
