| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $13,881 | $11,220 |
| 2016 | $14,171 | $11,117 |
| 2017 | $13,628 | $8,976 |
| 2018 | $13,628 | $8,609 |
| 2019 | $13,954 | $9,351 |
| 2020 | $14,014 | $9,411 |
| 2021* | $14,074 | $9,324 |
| 2022* | $14,135 | $9,239 |
| 2023* | $14,196 | $9,154 |
| 2024* | $14,257 | $9,069 |
| 2025* | $14,318 | $8,986 |