| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,289 | $15,877 |
| 2016 | $24,245 | $16,851 |
| 2017 | $25,062 | $17,492 |
| 2018 | $25,062 | $16,524 |
| 2019 | $25,560 | $16,697 |
| 2020 | $26,122 | $17,259 |
| 2021* | $26,697 | $17,841 |
| 2022* | $27,284 | $18,442 |
| 2023* | $27,884 | $19,063 |
| 2024* | $28,498 | $19,706 |
| 2025* | $29,125 | $20,370 |