| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $26,020 | $17,933 |
| 2016 | $26,817 | $18,897 |
| 2017 | $26,908 | $19,464 |
| 2018 | $26,908 | $18,480 |
| 2019 | $29,364 | $21,909 |
| 2020 | $29,684 | $22,229 |
| 2021* | $30,008 | $22,896 |
| 2022* | $30,335 | $23,583 |
| 2023* | $30,665 | $24,290 |
| 2024* | $31,000 | $25,019 |
| 2025* | $31,337 | $25,770 |