| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,553 | $13,447 |
| 2016 | $21,001 | $14,259 |
| 2017 | $21,327 | $13,952 |
| 2018 | $21,327 | $13,535 |
| 2019 | $24,469 | $16,021 |
| 2020 | $25,046 | $16,598 |
| 2021* | $25,592 | $17,196 |
| 2022* | $26,150 | $17,815 |
| 2023* | $26,720 | $18,456 |
| 2024* | $27,302 | $19,120 |
| 2025* | $27,898 | $19,809 |