| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $12,798 | $9,691 |
| 2016 | $11,900 | $8,851 |
| 2017 | $12,322 | $8,615 |
| 2018 | $12,322 | $8,252 |
| 2019 | $12,448 | $7,549 |
| 2020 | $12,712 | $7,813 |
| 2021* | $12,842 | $7,484 |
| 2022* | $12,973 | $7,169 |
| 2023* | $13,105 | $6,867 |
| 2024* | $13,239 | $6,578 |
| 2025* | $13,374 | $6,301 |