| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,665 | $16,415 |
| 2016 | $22,460 | $16,627 |
| 2017 | $22,147 | $15,990 |
| 2018 | $22,147 | $15,300 |
| 2019 | $23,231 | $16,288 |
| 2020 | $23,865 | $16,922 |
| 2021* | $24,517 | $17,140 |
| 2022* | $25,186 | $17,361 |
| 2023* | $25,873 | $17,585 |
| 2024* | $26,580 | $17,812 |
| 2025* | $27,305 | $18,042 |