2012

8.4

1981

7.0

1991

7.7

2013

6.9

1989

8.0

2016

7.5

2008

6.7

2019

6.6

1986

8.4

2018

8.2

2006

9.3

2017

6.8

2008

7.8

2013

8.6

1993

8.0

2017

7.9

1959

8.4

1997

7.2

2008

8.9

2010

8.6