| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,985 | $14,654 |
| 2016 | $22,110 | $12,237 |
| 2017 | $22,602 | $13,365 |
| 2018 | $22,602 | $12,748 |
| 2019 | $21,961 | $10,298 |
| 2020 | $23,163 | $11,500 |
| 2021* | $23,295 | $10,969 |
| 2022* | $23,428 | $10,462 |
| 2023* | $23,561 | $9,979 |
| 2024* | $23,696 | $9,518 |
| 2025* | $23,831 | $9,078 |