| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,860 | $16,583 |
| 2016 | $24,103 | $16,932 |
| 2017 | $24,424 | $16,926 |
| 2018 | $24,424 | $17,324 |
| 2019 | $25,574 | $18,336 |
| 2020 | $25,518 | $18,280 |
| 2021* | $25,778 | $18,664 |
| 2022* | $26,041 | $19,056 |
| 2023* | $26,307 | $19,456 |
| 2024* | $26,575 | $19,865 |
| 2025* | $26,846 | $20,282 |