| unit price | unit price for 10 stamps | |
|---|---|---|
| 2010 | 0.69 | 0.59 |
| 2011 | 0.71 | 0.61 |
| 2012 | 0.75 | 0.65 |
| 2013 | 0.77 | 0.67 |
| 2014 | 0.77 | 0.7 |
| 2015 | 0.77 | 0.7 |
| 2016 | 0.79 | 0.74 |
| 2017 | 0.79 | 0.74 |
| 2018 | 0.87 | 0.84 |
| 2019 | 1 | 0.97 |
| 2020 | 1.21 | 1.18 |
| 2021 | 1.6 | 1.57 |
| 2022 | 1.89 | 1.86 |
| 2023 | 2.17 | 2.14 |
| 2024 | 2.27 | 2.24 |
| 2025 | 2.37 | 2.33 |