2000

7.2

1995

7.4

1991

8.3

1987

7.6

2020

6.7

1984

7.2

1989

5.1

1970

6.3

1954

7.2

2002

7.5

1965

7.7

2004

5.8

1982

7.8

1955

7.2

2008

5.9

1928

7.8

1932

7.5

1980

6.1

1980

7.0

1993

6.9