PG58S-28 – $/Tonne
| Month | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
| January | N/A | $946.25 | $953.75 | $988.50 | $1,013.75 | $998.75 |
| February | $781.25 | $971.25 | $976.50 | $1,007.50 | $1,013.75 | $998.75 |
| March | $800.00 | $1,063.75 | $980.00 | $1,013.75 | $1,015.75 | $1101.25 |
| April | $857.50 | $1,132.50 | $1,003.25 | $1,037.50 | $1,017.50 | $1252.50 |
| May | $875.00 | $1,211.25 | $1,010.00 | $1,065.50 | $1,042.50 | $1285.00 |
| June | $898.75 | $1,266.25 | $1,030.75 | $1,081.25 | $1,048.75 | $1275.00 |
| July | $921.00 | $1,266.25 | $1,018.25 | $1,078.75 | $1,066.25 | $1283.75 |
| August | $917.50 | $1,243.75 | $1,060.00 | $1,068.25 | $1,060.00 | - |
| September | $923.75 | $1,186.75 | $1,061.75 | $1,044.50 | $1,057.50 | - |
| October | $932.50 | $1,111.25 | $1,060.00 | $1,030.00 | $1,048.75 | - |
| November | $932.50 | $1,030.00 | $1,038.00 | $1,002.50 | $1,033.25 | - |
| December | $932.50 | $985.00 | $986.25 | $995.00 | $1,005.00 | - |