1985

7.5

2020

8.0

2005

8.8

1992

7.1

2006

7.4

2007

7.0

1999

6.4

2004

8.2

1985

8.2

1988

7.8

1981

6.9

2012

7.6

1997

6.4

1983

7.7

2021

7.6

1979

7.7

2005

8.1

2005

5.0

1989

6.0

1997

0.0