| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,468 | $16,531 |
| 2016 | $25,082 | $17,289 |
| 2017 | $25,588 | $17,672 |
| 2018 | $25,588 | $16,961 |
| 2019 | $25,724 | $16,371 |
| 2020 | $26,176 | $16,823 |
| 2021* | $26,637 | $17,196 |
| 2022* | $27,106 | $17,578 |
| 2023* | $27,583 | $17,968 |
| 2024* | $28,068 | $18,367 |
| 2025* | $28,562 | $18,775 |