| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,777 | $13,912 |
| 2016 | $22,834 | $15,109 |
| 2017 | $23,673 | $16,414 |
| 2018 | $23,673 | $15,683 |
| 2019 | $23,869 | $15,555 |
| 2020 | $24,278 | $15,964 |
| 2021* | $24,693 | $16,384 |
| 2022* | $25,115 | $16,815 |
| 2023* | $25,545 | $17,257 |
| 2024* | $25,982 | $17,711 |
| 2025* | $26,426 | $18,177 |