| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,527 | $15,027 |
| 2016 | $24,641 | $16,444 |
| 2017 | $25,316 | $16,699 |
| 2018 | $25,316 | $16,885 |
| 2019 | $25,925 | $16,787 |
| 2020 | $25,097 | $15,959 |
| 2021* | $25,212 | $16,136 |
| 2022* | $25,328 | $16,315 |
| 2023* | $25,445 | $16,496 |
| 2024* | $25,562 | $16,679 |
| 2025* | $25,680 | $16,865 |