| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,134 | $11,773 |
| 2016 | $20,882 | $12,068 |
| 2017 | $20,861 | $11,183 |
| 2018 | $20,861 | $17,347 |
| 2019 | $25,009 | $16,523 |
| 2020 | $26,192 | $17,706 |
| 2021* | $27,166 | $18,150 |
| 2022* | $28,177 | $18,606 |
| 2023* | $29,225 | $19,073 |
| 2024* | $30,312 | $19,552 |
| 2025* | $31,440 | $20,042 |