| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,284 | $15,101 |
| 2016 | $22,019 | $14,287 |
| 2017 | $23,228 | $16,073 |
| 2018 | $23,228 | $14,777 |
| 2019 | $24,981 | $16,710 |
| 2020 | $25,090 | $16,819 |
| 2021* | $25,956 | $16,928 |
| 2022* | $26,851 | $17,038 |
| 2023* | $27,777 | $17,149 |
| 2024* | $28,736 | $17,261 |
| 2025* | $29,727 | $17,373 |