| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,724 | $22,274 |
| 2016 | $28,613 | $20,891 |
| 2017 | $29,518 | $21,409 |
| 2018 | $29,518 | $22,291 |
| 2019 | $29,823 | $22,450 |
| 2020 | $29,861 | $22,488 |
| 2021* | $29,900 | $22,648 |
| 2022* | $29,939 | $22,808 |
| 2023* | $29,978 | $22,970 |
| 2024* | $30,017 | $23,133 |
| 2025* | $30,056 | $23,298 |