1985

7.4

1996

7.7

1983

8.0

2006

8.1

1990

6.9

1996

6.4

2006

7.3

2005

7.6

2017

8.1

2005

8.3

2008

8.9

1985

7.8

1982

7.8

1984

7.5

2009

8.0

1960

7.4

2013

8.7

2023

7.9

1993

8.0

2005

7.0