1974

6.0

2010

7.2

1992

7.7

1987

5.2

1998

5.1

2007

7.4

1981

6.3

2009

7.5

2000

5.5

1994

7.4

2007

7.7

1987

7.4

1989

7.5

2016

4.9

1976

5.5

1988

7.4

2020

6.9

2003

6.5

2004

9.9

1979

6.4