| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,576 | $13,958 |
| 2016 | $19,234 | $14,268 |
| 2017 | $18,625 | $14,026 |
| 2018 | $18,625 | $13,258 |
| 2019 | $19,053 | $15,583 |
| 2020 | $19,373 | $15,903 |
| 2021* | $19,698 | $16,229 |
| 2022* | $20,029 | $16,562 |
| 2023* | $20,366 | $16,901 |
| 2024* | $20,708 | $17,248 |
| 2025* | $21,056 | $17,601 |