2001

6.7

1957

7.2

2006

5.4

1990

5.8

1998

6.3

1987

6.5

1990

6.5

1999

7.9

2013

8.1

1988

6.4

1964

7.5

1962

7.6

1956

7.1

2008

5.2

1982

7.3

1987

6.5

2000

7.2

1970

7.3

1948

7.2

1964

7.3