| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,255 | $16,410 |
| 2016 | $22,645 | $15,967 |
| 2017 | $23,359 | $15,756 |
| 2018 | $23,359 | $14,724 |
| 2019 | $25,459 | $14,581 |
| 2020 | $24,775 | $13,897 |
| 2021* | $25,209 | $13,522 |
| 2022* | $25,650 | $13,157 |
| 2023* | $26,099 | $12,801 |
| 2024* | $26,555 | $12,456 |
| 2025* | $27,020 | $12,120 |