| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,446 | $14,289 |
| 2016 | $23,795 | $11,301 |
| 2017 | $24,149 | $13,632 |
| 2018 | $24,149 | $13,089 |
| 2019 | $25,276 | $14,832 |
| 2020 | $26,181 | $15,737 |
| 2021* | $26,571 | $16,697 |
| 2022* | $26,967 | $17,715 |
| 2023* | $27,369 | $18,796 |
| 2024* | $27,777 | $19,943 |
| 2025* | $28,190 | $21,159 |