| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,202 | $18,518 |
| 2016 | $23,508 | $17,790 |
| 2017 | $23,877 | $19,611 |
| 2018 | $23,877 | $19,062 |
| 2019 | $24,489 | $19,822 |
| 2020 | $26,923 | $22,256 |
| 2021* | $27,346 | $23,144 |
| 2022* | $27,775 | $24,067 |
| 2023* | $28,211 | $25,028 |
| 2024* | $28,654 | $26,026 |
| 2025* | $29,104 | $27,065 |