| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,225 | $13,869 |
| 2016 | $20,482 | $13,886 |
| 2017 | $21,004 | $13,971 |
| 2018 | $21,004 | $14,037 |
| 2019 | $22,406 | $14,768 |
| 2020 | $22,997 | $15,359 |
| 2021* | $23,583 | $15,453 |
| 2022* | $24,185 | $15,547 |
| 2023* | $24,802 | $15,642 |
| 2024* | $25,434 | $15,737 |
| 2025* | $26,083 | $15,833 |