8.7
en
2013
N/A
tl
1999
8.9
2008
6.8
1993
6.6
1989
ja
1987
5.7
2003
6.2
tr
2007
5.3
2002
7.4
2011
de
1957
ru
2010
6.9
1975
8.4
1997
4.0
el
2018
6.0
es
zh
5.5
hi
7.5
1971