| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,017 | $16,385 |
| 2016 | $23,216 | $15,611 |
| 2017 | $23,488 | $15,984 |
| 2018 | $23,488 | $14,991 |
| 2019 | $24,468 | $15,182 |
| 2020 | $24,877 | $15,591 |
| 2021* | $25,168 | $15,789 |
| 2022* | $25,463 | $15,990 |
| 2023* | $25,760 | $16,193 |
| 2024* | $26,062 | $16,398 |
| 2025* | $26,367 | $16,606 |