1985

7.1

1974

6.5

1998

6.1

1993

6.5

2008

6.4

1991

5.9

1963

6.9

2012

9.4

2006

6.7

2019

6.5

2001

9.9

1987

7.0

1978

5.9

1988

6.5

2011

7.5

1966

6.1

1989

5.5

1971

6.8

2017

6.6

2014

6.3