1946

7.6

1968

7.1

1979

7.2

1963

7.5

1972

7.1

1956

7.5

2001

7.8

1999

7.0

2007

6.6

1948

7.9

1996

7.4

2002

6.3

2007

6.7

2008

4.5

1974

6.2

2001

6.2

1990

5.7

1942

6.9

1973

7.3

1995

3.8