| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,801 | $14,055 |
| 2016 | $20,021 | $15,148 |
| 2017 | $21,038 | $16,121 |
| 2018 | $21,038 | $15,507 |
| 2019 | $21,629 | $15,828 |
| 2020 | $22,149 | $16,348 |
| 2021* | $22,771 | $16,886 |
| 2022* | $23,411 | $17,441 |
| 2023* | $24,069 | $18,015 |
| 2024* | $24,745 | $18,608 |
| 2025* | $25,441 | $19,220 |
