| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,808 | $14,147 |
| 2016 | $19,072 | $14,121 |
| 2017 | $19,564 | $14,326 |
| 2018 | $19,564 | $14,031 |
| 2019 | $20,705 | $14,966 |
| 2020 | $21,216 | $15,477 |
| 2021* | $21,740 | $15,701 |
| 2022* | $22,277 | $15,929 |
| 2023* | $22,827 | $16,160 |
| 2024* | $23,391 | $16,394 |
| 2025* | $23,969 | $16,632 |