1989

8.0

2003

8.5

2007

7.9

2008

8.5

2009

7.6

1998

6.6

1987

7.5

1993

7.7

2021

7.3

2016

8.5

2011

6.4

2004

7.3

1999

7.3

1998

6.4

1976

7.8

2010

5.8

1968

8.1

1977

8.2

2022

6.8

1980

7.3