1993

7.3

1968

6.9

1993

6.1

2007

6.8

1964

7.0

2015

5.9

1983

7.9

1945

7.2

2014

5.2

1998

6.4

1970

6.4

2017

6.0

1965

6.6

2003

6.6

1980

5.4

1991

5.7

1985

6.6

1997

6.7