1960

7.5

1998

7.3

1978

7.4

1981

6.8

1995

5.9

1981

7.0

1994

6.8

1997

4.5

2014

5.9

1962

7.2

2008

5.7

1982

5.9

2007

7.5

1995

4.8

2003

5.4

1987

6.4

2001

6.3

2001

5.1

1976

7.2

2016

5.4