1986

6.7

1989

7.0

2007

6.1

2003

7.9

1981

7.4

1985

7.2

2014

6.3

2003

6.8

1998

9.4

1944

6.9

2008

5.1

2004

7.5

1976

4.2

1987

7.3

2007

6.4

1990

6.9

2007

7.6

1992

6.2

2017

7.3

1973

7.9