1995

8.4

1997

6.0

1972

6.2

1934

7.5

1982

5.2

2008

6.3

2017

6.8

1962

5.5

1988

6.1

1984

6.8

2008

6.0

2014

7.1

1973

7.4

1998

5.4

2014

6.7

1955

7.3

2004

6.6

1988

7.7

2002

6.2

2001

6.7