| 2008 | 2009 | 2010 | 2011 | 2012 |
G1 method | 0.2253 | 0.2445 | 0.2639 | 0.2985 | 0.3062 |
G2 method | 0.2223 | 0.2280 | 0.2400 | 0.2600 | 0.2147 |
Entropy method | 0.0374 | 0.1198 | 0.0756 | 0.0743 | 0.0459 |
Maximize deviation method | 0.5150 | 0.4077 | 0.4205 | 0.3671 | 0.4333 |