| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $16,173 | $10,846 |
| 2016 | $16,293 | $11,024 |
| 2017 | $22,015 | $16,896 |
| 2018 | $22,015 | $16,805 |
| 2019 | $21,137 | $15,857 |
| 2020 | $21,773 | $16,493 |
| 2021* | $21,934 | $16,763 |
| 2022* | $22,096 | $17,038 |
| 2023* | $22,260 | $17,318 |
| 2024* | $22,425 | $17,602 |
| 2025* | $22,591 | $17,891 |