| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,112 | $13,572 |
| 2016 | $19,041 | $14,556 |
| 2017 | $19,439 | $15,089 |
| 2018 | $19,439 | $13,978 |
| 2019 | $20,723 | $15,112 |
| 2020 | $21,003 | $15,392 |
| 2021* | $21,442 | $15,955 |
| 2022* | $21,890 | $16,539 |
| 2023* | $22,348 | $17,145 |
| 2024* | $22,815 | $17,772 |
| 2025* | $23,291 | $18,423 |