2000

6.5

1981

7.0

1985

6.9

1930

7.8

1937

7.9

1959

7.2

2002

6.7

1970

7.5

2007

7.9

1998

7.2

2002

7.1

1964

6.5

2018

7.8

1962

7.6

1993

6.2

2014

6.8

1983

7.8

1963

7.7

1993

6.4

2003

7.1