6%
Operational Standard
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| 2009 | ||||||||||||
| 2010 | ||||||||||||
| 2011 | 3.9746835% | 1.4840799% | 1.4621285% | 1.5833818% | 2.1036024% | 1.7915114% | 1.3840830% | 1.8702793% | 2.2188793% | 1.7829177% | 1.2132353% | 1.2432123% |
| 2012 | 2.4037906% | 1.5976852% | 1.8430367% | 3.1590268% | 2.1673621% | 2.1123954% | 2.1480629% | 1.6822200% | 2.4860409% | 1.9013078% | 1.8219614% | 1.2075818% |
| 2013 | 2.5523340% | 1.5390585% | 1.5472097% | 2.6158730% | 1.7539495% | 1.7623650% | 1.7733412% | 1.8013245% | 2.0713464% | 1.9843520% | 3.5319493% | 3.2325194% |
| 2014 | 4.0507790% | 2.0302599% | 2.3950647% | 2.6874463% | 2.9052189% | 3.1212048% | 2.3121387% | 2.7696995% | 3.0842959% | 2.2152282% | 1.7410952% | 2.5314778% |
| 2015 | 3.5356736% | 1.3591977% | 1.7835767% | 2.6374200% | 2.3461220% | 2.2896964% | 2.0956281% | 2.4044475% | 2.8643036% | 2.2757216% | 2.2099448% | 1.6966987% |
| 2016 | 4.0352445% | 1.9191556% | 2.1668079% | 3.1891892% | 2.4504692% | 2.8685877% | 2.5626894% | 3.3443994% | 3.4750972% | 2.6154224% | 2.1883690% | 1.7793594% |
| 2017 | 3.8196097% | 2.1159272% | 2.6852720% | 3.0541872% | 3.3071259% | 3.2164113% | 2.9896422% | 2.6385224% | 3.3889667% | 2.9382743% | 2.4503542% |