1992

8.2

1998

8.2

1999

7.4

2004

8.0

1978

6.8

1998

7.5

2011

7.3

2001

7.8

2014

8.4

2011

7.4

1981

7.4

2013

6.8

2007

7.8

1991

7.7

2018

7.6

2016

7.6

2015

6.0

1995

7.3

1973

8.2

2012

7.7