| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,074 | $12,447 |
| 2016 | $21,230 | $12,270 |
| 2017 | $21,276 | $12,736 |
| 2018 | $21,276 | $12,412 |
| 2019 | $22,732 | $14,039 |
| 2020 | $25,118 | $16,425 |
| 2021* | $25,304 | $17,049 |
| 2022* | $25,491 | $17,697 |
| 2023* | $25,680 | $18,370 |
| 2024* | $25,870 | $19,068 |
| 2025* | $26,061 | $19,792 |