| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,140 | $7,415 |
| 2016 | $17,540 | $6,829 |
| 2017 | $17,700 | $6,003 |
| 2018 | $17,700 | $5,936 |
| 2019 | $18,350 | $4,980 |
| 2020 | $18,360 | $4,990 |
| 2021* | $18,527 | $4,596 |
| 2022* | $18,696 | $4,233 |
| 2023* | $18,866 | $3,898 |
| 2024* | $19,037 | $3,590 |
| 2025* | $19,211 | $3,307 |