WHO

2008

2009

2010

2011

2012

2013

2014

2015

Mean

Beijing

9%

10%

10%

16%

15%

10%

13%

20%

13%

Shanghai

21%

17%

17%

18%

18%

Chengdu

2%

2%

1%

4%

3%

Guangzhou

6%

20%

16%

20%

35%

22%

Shenyang

13%

5%

10%

9%