| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,762 | $14,774 |
| 2016 | $24,002 | $16,490 |
| 2017 | $24,775 | $16,391 |
| 2018 | $24,775 | $16,876 |
| 2019 | $26,620 | $16,649 |
| 2020 | $27,062 | $17,091 |
| 2021* | $27,933 | $17,544 |
| 2022* | $28,833 | $18,009 |
| 2023* | $29,761 | $18,486 |
| 2024* | $30,720 | $18,976 |
| 2025* | $31,709 | $19,479 |