| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,892 | $18,562 |
| 2016 | $25,220 | $16,857 |
| 2017 | $25,630 | $16,537 |
| 2018 | $25,630 | $15,732 |
| 2019 | $27,718 | $16,147 |
| 2020 | $27,720 | $16,149 |
| 2021* | $27,723 | $15,842 |
| 2022* | $27,726 | $15,541 |
| 2023* | $27,728 | $15,246 |
| 2024* | $27,731 | $14,956 |
| 2025* | $27,734 | $14,672 |
