| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,264 | $15,856 |
| 2016 | $20,389 | $16,068 |
| 2017 | $20,776 | $16,189 |
| 2018 | $20,776 | $15,933 |
| 2019 | $21,282 | $15,697 |
| 2020 | $21,830 | $16,245 |
| 2021* | $22,245 | $16,367 |
| 2022* | $22,667 | $16,490 |
| 2023* | $23,098 | $16,613 |
| 2024* | $23,537 | $16,738 |
| 2025* | $23,984 | $16,863 |