| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,340 | $11,399 |
| 2016 | $20,540 | $12,327 |
| 2017 | $23,900 | $15,478 |
| 2018 | $23,900 | $12,514 |
| 2019 | $23,036 | $13,938 |
| 2020 | $23,420 | $14,322 |
| 2021* | $23,811 | $15,488 |
| 2022* | $24,209 | $16,749 |
| 2023* | $24,613 | $18,112 |
| 2024* | $25,024 | $19,586 |
| 2025* | $25,442 | $21,180 |