| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $15,483 | $12,044 |
| 2016 | $15,530 | $12,163 |
| 2017 | $15,935 | $11,854 |
| 2018 | $15,935 | $12,670 |
| 2019 | $17,283 | $13,731 |
| 2020 | $17,809 | $14,257 |
| 2021* | $18,274 | $14,803 |
| 2022* | $18,751 | $15,370 |
| 2023* | $19,240 | $15,959 |
| 2024* | $19,742 | $16,570 |
| 2025* | $20,258 | $17,205 |