6%
Operational Standard
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| 2009 | 2.9607895% | 3.2619776% | 2.7050114% | |||||||||
| 2010 | 3.9577836% | 2.6833631% | 2.4896266% | 2.7895855% | 2.3376623% | 2.2174535% | 2.6117647% | 3.3090824% | 3.1496063% | 2.4955036% | 3.1885299% | 2.6760919% |
| 2011 | 4.3789291% | 3.0486386% | 2.4848485% | 2.4148449% | 3.1263957% | 2.2756274% | 1.8031718% | 2.4416363% | 2.7700236% | 2.8187060% | 2.6568567% | 1.9350215% |
| 2012 | 3.4893801% | 2.2874307% | 2.5999563% | 2.5754231% | 2.3970498% | 2.9209214% | 2.1210782% | 2.5820569% | 2.8237370% | 2.6849527% | 2.5750203% | 2.5851355% |
| 2013 | 3.8328236% | 2.3154516% | 2.6091082% | 2.8447883% | 1.9123860% | 2.1945022% | 2.2191124% | 2.1885914% | 2.8730512% | 2.5707453% | 3.1489362% | 3.3015407% |
| 2014 | 3.6269430% | 3.1965541% | 2.9827999% | 3.0539610% | 4.4131455% | 3.8837106% | 3.9473684% | 4.2274052% | 4.2002546% | 3.9769215% | 4.5852535% | 4.5340624% |
| 2015 | 6.0736593% | 4.6092653% | 4.7061284% | 5.8217537% | 4.7413793% | 4.7529313% | 4.1728763% | 4.6046287% | 4.2482986% | 3.9025397% | 4.2296735% | 3.4859877% |
| 2016 | 5.5180180% | 4.2268944% | 4.5688690% | 5.4148269% | 5.1700368% | 3.7109375% | 3.9933046% | 4.2007517% | 4.7821467% | 4.1936879% | 5.4103343% | 4.4681884% |
| 2017 | 5.8542661% | 4.1531323% | 4.1784990% | 4.6027132% | 3.9274924% | 3.5061936% | 3.9638846% | 4.1267815% | 4.7242364% | 4.3705942% | 4.5176563% |