http://www.schroders.com/en/uk/schrodersglobalcities/blog/interact/schroders-global-cities-index/
a list of the top 30 cities below:
1 8.6 Shanghai
2 8.6 New York
3 8.6 Tianjin
4 8.5 Beijing
5 8.5 Dallas
6 8.5 Shenzhen
7 8.5 Los Angeles
8 8.5 Houston
9 8.2 Washington
10 8.2 London
。。。。。。
20 8.0 Chongqing
。。。。。。
26 7.8 Hong Kong
27 7.8 Singapore
。。。。。。