| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,026 | $13,098 |
| 2016 | $21,920 | $13,056 |
| 2017 | $22,402 | $13,198 |
| 2018 | $22,402 | $13,105 |
| 2019 | $23,616 | $14,669 |
| 2020 | $24,062 | $15,115 |
| 2021* | $24,591 | $15,280 |
| 2022* | $25,132 | $15,446 |
| 2023* | $25,685 | $15,615 |
| 2024* | $26,250 | $15,785 |
| 2025* | $26,828 | $15,957 |
