| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,311 | $13,965 |
| 2016 | $18,657 | $14,292 |
| 2017 | $18,761 | $14,360 |
| 2018 | $18,761 | $14,330 |
| 2019 | $17,942 | $13,053 |
| 2020 | $18,078 | $13,189 |
| 2021* | $18,179 | $13,252 |
| 2022* | $18,281 | $13,316 |
| 2023* | $18,383 | $13,380 |
| 2024* | $18,486 | $13,444 |
| 2025* | $18,590 | $13,509 |