| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,843 | $13,145 |
| 2016 | $19,096 | $13,394 |
| 2017 | $17,715 | $12,136 |
| 2018 | $17,715 | $12,056 |
| 2019 | $19,171 | $13,051 |
| 2020 | $19,995 | $13,875 |
| 2021* | $20,263 | $14,137 |
| 2022* | $20,534 | $14,404 |
| 2023* | $20,810 | $14,677 |
| 2024* | $21,088 | $14,954 |
| 2025* | $21,371 | $15,237 |