| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,994 | $14,901 |
| 2016 | $22,486 | $13,975 |
| 2017 | $23,182 | $13,723 |
| 2018 | $23,182 | $14,195 |
| 2019 | $23,388 | $15,541 |
| 2020 | $24,166 | $16,319 |
| 2021* | $24,707 | $16,880 |
| 2022* | $25,261 | $17,461 |
| 2023* | $25,827 | $18,062 |
| 2024* | $26,405 | $18,683 |
| 2025* | $26,997 | $19,326 |