China's Great Wall

6

/

2011

8

/

2018

4.7

/

2015

5.9

/

2014

0

/

1989

4.2

/

2016

9

/

2021

0

/

2007

7

/

2019

0

/

NaN

5.501

/

2008

5.748

/

2003

4.6

/

1987

6.36

/

2005

7.906

/

1998

6.031

/

2016

6

/

1962

8.1

/

2013

6.929

/

2019

7.4

/

2020