2000

8.1

1974

8.0

2014

7.1

2017

6.8

1997

6.4

1977

8.1

2009

7.4

2009

6.1

1988

7.4

1982

7.9

2004

7.3

2018

7.4

2011

7.2

2000

7.4

1969

6.7

1998

8.2

1986

8.4

2015

7.7

1993

7.7

2006

4.5