| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,974 | $16,520 |
| 2016 | $21,377 | $16,879 |
| 2017 | $22,274 | $17,457 |
| 2018 | $22,274 | $17,129 |
| 2019 | $23,399 | $18,191 |
| 2020 | $23,502 | $18,294 |
| 2021* | $23,953 | $18,691 |
| 2022* | $24,413 | $19,097 |
| 2023* | $24,882 | $19,511 |
| 2024* | $25,360 | $19,934 |
| 2025* | $25,847 | $20,367 |
