| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $14,493 | $10,779 |
| 2016 | $16,623 | $9,317 |
| 2017 | $14,952 | $8,676 |
| 2018 | $14,952 | $14,207 |
| 2019 | $18,307 | $12,797 |
| 2020 | $18,710 | $13,200 |
| 2021* | $19,122 | $12,292 |
| 2022* | $19,542 | $11,446 |
| 2023* | $19,972 | $10,659 |
| 2024* | $20,412 | $9,925 |
| 2025* | $20,861 | $9,242 |