Years

Beijing

China

The United States

Japan

2006

0.367

2.738

0.897

0.341

2007

0.510

2.568

0.917

0.675

2008

0.567

2.643

0.931

0.613

2009

0.365

2.594

0.896

0.537

2010

0.526

2.784

0.884

0.474

2011

0.688

2.816

0.923

0.482

2012

0.746

2.887

0.958

0.408