7%
Operational Standard
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| 2009 | 4.884789% | 4.219847% | 4.103077% | |||||||||
| 2010 | 6.297986% | 3.445923% | 3.747386% | 4.695373% | 4.071429% | 4.829704% | 4.821949% | 5.272500% | 5.024813% | 4.311493% | 3.768862% | 5.430809% |
| 2011 | 4.966352% | 3.232531% | 3.823045% | 3.946675% | 4.990935% | 4.712399% | 4.324025% | 4.277040% | 4.453749% | 3.973639% | 3.768525% | 3.624155% |
| 2012 | 3.943662% | 3.514401% | 3.769092% | 5.438066% | 4.091347% | 5.103135% | 4.495736% | 4.712803% | 4.565412% | 4.290913% | 4.313773% | 3.814735% |
| 2013 | 5.275737% | 3.701229% | 3.881815% | 4.745459% | 4.248237% | 4.542681% | 4.328121% | 5.081618% | 4.920173% | 4.340698% | 4.464703% | 4.455306% |
| 2014 | 6.070133% | 4.131765% | 4.660792% | 6.528909% | 6.412252% | 6.513052% | 5.982942% | 6.958276% | 6.115354% | 5.371384% | 5.281120% | 5.139695% |
| 2015 | 6.108627% | 4.426797% | 5.500137% | 7.341625% | 5.683846% | 5.906211% | 6.087692% | 6.821892% | 6.678844% | 5.265661% | 5.251329% | 5.174786% |
| 2016 | 6.448126% | 4.588813% | 5.130816% | 6.960938% | 5.977086% | 6.143983% | 5.622027% | 6.036382% | 5.890661% | 5.162002% | 4.858459% | 4.542730% |
| 2017 | 6.021640% | 4.579788% | 5.256904% | 7.182287% | 5.996875% | 5.914518% | 5.955389% | 6.438017% | 6.043175% | 5.275128% | 4.861279% |