| Year | Apr | Jul | Oct | Jan | Annual |
|---|---|---|---|---|---|
| 2021 | -1.8 | - | - | - | -1.8 |
| 2020 | -1.1 | -0.2 | -0.24 | - | -1.54 |
| 2019 | -0.38 | -0.24 | -0.3 | -0.21 | -1.13 |
| 2018 | -0.66 | -0.52 | -0.41 | -0.47 | -2.06 |
| 2017 | - | - | 0.46 | 0.46 | 0.92 |
| 2016 | - | - | - | - | - |
| 2015 | - | - | - | - | - |
| 2014 | 0.29 | -0.26 | -0.03 | 0.14 | 0.36 |
| 2013 | 0.48 | -0.05 | -0.21 | 0.28 | 1.29 |
| 2012 | 0.63 | 0.48 | -0.10 | 0.81 | 2.02 |
| 2011 | 0.58 | 0.11 | 0.52 | 0.16 | 0.46 |
| 2010 | 0.24 | -0.01 | 0.07 | 0.06 | 0.05 |
| 2009 | -0.01 | -0.10 | 0.10 | 0.05 | 0.89 |
| 2008 | 0.41 | 0.16 | 0.27 | 0.31 | 1.11 |
| 2007 | 0.39 | 0.17 | 0.24 | 0.10 | 0.93 |
| 2006 | 0.33 | 0.12 | 0.38 | 0.46 | 1.1 |
| 2005 | 0.22 | 0.13 | 0.29 | 0.15 | 0.23 |
