2004

6.4

1992

6.6

1983

7.4

2002

7.0

1982

7.2

1991

6.6

1995

6.2

1995

7.3

1993

4.4

2012

5.5

2016

5.4

1972

5.5

1981

6.6

2000

7.1

1987

6.3

2008

6.8

1952

6.7

1981

7.1

1948

7.5

1994

6.6