| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,367 | $12,997 |
| 2016 | $23,951 | $14,739 |
| 2017 | $24,721 | $15,071 |
| 2018 | $24,721 | $15,683 |
| 2019 | $25,344 | $15,859 |
| 2020 | $25,564 | $16,079 |
| 2021* | $26,203 | $16,441 |
| 2022* | $26,858 | $16,811 |
| 2023* | $27,530 | $17,189 |
| 2024* | $28,218 | $17,576 |
| 2025* | $28,923 | $17,971 |