| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,544 | $26,771 |
| 2016 | $29,004 | $24,955 |
| 2017 | $28,626 | $24,265 |
| 2018 | $28,626 | $22,811 |
| 2019 | $28,284 | $22,392 |
| 2020 | $25,041 | $19,149 |
| 2021* | $24,715 | $18,002 |
| 2022* | $24,394 | $16,924 |
| 2023* | $24,077 | $15,910 |
| 2024* | $23,764 | $14,957 |
| 2025* | $23,455 | $14,061 |
