| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,673 | $18,400 |
| 2016 | $25,230 | $19,231 |
| 2017 | $25,635 | $19,174 |
| 2018 | $25,635 | $18,902 |
| 2019 | $26,553 | $18,229 |
| 2020 | $27,158 | $18,834 |
| 2021* | $27,772 | $18,777 |
| 2022* | $28,399 | $18,721 |
| 2023* | $29,041 | $18,665 |
| 2024* | $29,698 | $18,609 |
| 2025* | $30,369 | $18,553 |