1957

7.0

1985

6.6

1993

6.5

1975

4.4

1968

4.2

2009

6.0

2004

6.8

1993

6.6

1986

3.3

2008

6.0

2003

7.4

1960

8.1

2002

8.4

2018

6.1

2007

6.2

1964

6.2

1991

4.7

2005

7.0

2013

6.1

1940

7.6