1985

6.2

1960

7.5

1999

6.7

2001

4.9

2007

5.3

1991

6.7

1989

5.3

2019

6.4

1987

6.1

1985

7.0

2001

7.6

1943

6.0

2017

6.0

2002

5.7

1994

4.3

1988

6.6

2005

5.8

2004

7.2

2005

7.2

1974

6.1