1976

7.0

1966

7.2

2007

5.6

2008

1.5

2006

7.1

1991

6.2

1986

7.3

2002

7.1

2006

4.9

1996

6.8

2022

2.0

2000

6.2

2004

6.3

1997

6.5

2003

6.5

2017

6.2

1973

6.8

1952

7.3

2011

2.5

1967

6.5