1951

6.3

1976

5.2

2020

6.3

2002

6.4

2017

6.1

2006

5.9

2006

6.3

1983

6.7

2008

6.7

1977

5.6

2016

7.6

1997

4.6

1955

6.0

1996

6.3

2005

6.5

1998

6.8

1998

5.4

2000

6.5

1989

5.3

2013

6.6