| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,070 | $17,703 |
| 2016 | $22,362 | $18,219 |
| 2017 | $23,758 | $19,361 |
| 2018 | $23,758 | $17,965 |
| 2019 | $25,439 | $19,274 |
| 2020 | $25,693 | $19,528 |
| 2021* | $25,950 | $20,096 |
| 2022* | $26,209 | $20,681 |
| 2023* | $26,472 | $21,283 |
| 2024* | $26,736 | $21,902 |
| 2025* | $27,004 | $22,540 |