| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,858 | $13,410 |
| 2016 | $24,605 | $14,873 |
| 2017 | $24,946 | $15,983 |
| 2018 | $24,946 | $15,416 |
| 2019 | $23,979 | $14,302 |
| 2020 | $24,631 | $14,954 |
| 2021* | $24,973 | $15,636 |
| 2022* | $25,321 | $16,349 |
| 2023* | $25,672 | $17,094 |
| 2024* | $26,029 | $17,874 |
| 2025* | $26,391 | $18,689 |