| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,580 | $11,930 |
| 2016 | $17,730 | $11,257 |
| 2017 | $17,855 | $10,363 |
| 2018 | $17,855 | $9,467 |
| 2019 | $18,780 | $11,685 |
| 2020 | $19,780 | $12,685 |
| 2021* | $19,948 | $11,970 |
| 2022* | $20,118 | $11,294 |
| 2023* | $20,289 | $10,657 |
| 2024* | $20,461 | $10,056 |
| 2025* | $20,635 | $9,489 |