1975

6.4

1984

6.5

2006

6.7

1976

7.0

2004

6.2

1949

8.0

1952

7.7

2003

5.7

2003

7.3

1990

6.2

1956

7.5

1958

7.3

2009

7.3

1972

7.8

1995

7.6

2019

7.0

2002

8.0

1963

7.3

2010

5.6

2012

8.2