| Year | Jan | Feb | Mar | Api | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2010 | 1.5 | 1.2 | 0.8 | 0.4 | 0.2 | −0.7 | −1.0 | −1.3 | −1.6 | −1.6 | −1.6 | −1.6 |
| 2011 | −1.4 | −1.2 | −0.9 | −0.7 | −0.6 | −0.4 | −0.5 | −0.6 | −0.8 | −1.0 | −1.1 | −1.0 |
| 2012 | −0.9 | −0.7 | −0.6 | −0.5 | −0.3 | 0.0 | 0.2 | 0.4 | 0.4 | 0.3 | 0.1 | 0.2 |
| 2013 | −0.4 | −0.4 | −0.3 | −0.3 | −0.4 | −0.4 | −0.4 | −0.3 | −0.3 | −0.2 | −0.2 | −0.3 |
| 2014 | −0.4 | −0.5 | −0.3 | 0.0 | 0.2 | 0.2 | 0.0 | 0.1 | 0.2 | 0.5 | 0.6 | 0.7 |
| 2015 | 0.5 | 0.5 | 0.5 | 0.7 | 0.9 | 1.2 | 1.5 | 1.9 | 2.2 | 2.4 | 2.6 | 2.6 |
| 2016 | 2.5 | 2.1 | 1.6 | 0.9 | 0.4 | −0.1 | −0.4 | −0.5 | −0.6 | −0.7 | −0.7 | −0.6 |
| 2017 | −0.3 | −0.2 | 0.1 | 0.2 | 0.3 | 0.3 | 0.1 | −0.1 | −0.4 | −0.7 | −0.8 | −1.0 |
| 2018 | −0.9 | −0.9 | −0.7 | −0.5 | −0.2 | 0.0 | 0.1 | 0.2 | 0.5 | 0.8 | 0.9 | 0.8 |
| 2019 | 0.7 | 0.7 | 0.7 | 0.7 | 0.5 | 0.5 | 0.3 | 0.1 | 0.2 | 0.3 | 0.5 | 0.5 |
| 2020 | 0.5 | 0.5 | 0.4 | 0.2 | −0.1 | −0.3 | −0.4 | −0.6 | −0.9 | −1.2 | −1.3 | −1.2 |
| 2021 | −1.0 | −0.9 | −0.8 | −0.7 | −0.5 | −0.4 | −0.4 | −0.5 | −0.5 | −0.9 | −0.9 | −1.0 |