| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,508 | $16,959 |
| 2016 | $23,824 | $17,345 |
| 2017 | $24,168 | $17,575 |
| 2018 | $24,168 | $16,730 |
| 2019 | $25,156 | $16,620 |
| 2020 | $25,095 | $16,559 |
| 2021* | $25,431 | $16,498 |
| 2022* | $25,772 | $16,437 |
| 2023* | $26,117 | $16,376 |
| 2024* | $26,467 | $16,315 |
| 2025* | $26,822 | $16,255 |
