| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,436 | $14,357 |
| 2016 | $21,972 | $13,677 |
| 2017 | $22,142 | $14,621 |
| 2018 | $22,142 | $14,461 |
| 2019 | $23,531 | $16,245 |
| 2020 | $25,218 | $17,932 |
| 2021* | $25,412 | $19,169 |
| 2022* | $25,608 | $20,492 |
| 2023* | $25,805 | $21,906 |
| 2024* | $26,004 | $23,417 |
| 2025* | $26,204 | $25,033 |