| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,110 | $15,037 |
| 2016 | $21,118 | $16,259 |
| 2017 | $22,052 | $17,546 |
| 2018 | $22,052 | $16,917 |
| 2019 | $24,300 | $17,861 |
| 2020 | $24,300 | $17,861 |
| 2021* | $24,310 | $18,858 |
| 2022* | $24,319 | $19,910 |
| 2023* | $24,329 | $21,021 |
| 2024* | $24,339 | $22,194 |
| 2025* | $24,349 | $23,432 |