1992

8.2

2017

4.8

2023

8.0

1997

7.9

2019

8.1

1985

8.3

2010

8.2

2019

7.4

2014

7.7

2002

7.1

2005

7.7

1994

8.7

1985

7.7

2008

6.8

2007

7.2

1999

8.0

1968

8.1

2015

7.6

2011

7.5

1998

8.1