| Year | Sep | Dec | Mar | Jun | Annual |
|---|---|---|---|---|---|
| 2021 | 2.03 | 2.17 | - | - | 4.2 |
| 2020 | 1.4 | 1.47 | 1.82 | 2.03 | 6.72 |
| 2019 | 1.14 | 1.37 | 1.38 | 1.51 | 5.4 |
| 2018 | 0.95 | 1.13 | 1.14 | 1.10 | 4.32 |
| 2017 | 0.73 | 0.98 | 0.84 | 0.96 | 3.51 |
| 2016 | 0.62 | 0.69 | 0.76 | 0.83 | 2.9 |
| 2015 | 0.62 | 0.62 | 0.67 | 0.78 | 2.69 |
| 2014 | 0.54 | 0.71 | 0.68 | 0.55 | 2.63 |
| 2013 | 0.62 | 0.78 | 0.72 | 0.57 | 2.58 |
| 2012 | 0.53 | 0.76 | 0.60 | -0.06 | 2 |
| 2011 | 0.68 | 0.78 | 0.61 | 0.69 | 2.69 |
| 2010 | 0.62 | 0.77 | 0.45 | 0.51 | 2.1 |
| 2009 | 0.40 | 0.74 | 0.33 | 0.34 | 1.62 |
| 2008 | 0.48 | 0.47 | 0.47 | 0.45 | 1.87 |
| 2007 | 0.45 | 0.50 | 0.50 | 0.31 | 1.42 |
| 2006 | 0.35 | 0.26 | 0.29 | 0.28 | 1.2 |
| 2005 | 0.29 | 0.34 | 0.23 | 0.34 | 1.12 |