2007

7.5

2010

8.1

1993

7.9

2006

7.1

1979

7.4

2005

7.6

2003

7.8

2018

8.2

2017

7.4

1995

7.8

1986

8.3

2009

8.3

1989

8.1

1989

8.0

1985

7.7

1987

8.4

2011

8.5

2004

8.2

2001

7.6

2016

6.8