1995

7.2

2001

7.0

1991

7.3

1993

7.3

2013

8.4

1992

7.9

2007

8.1

2003

7.2

2009

7.4

2004

8.1

2006

8.3

2018

7.8

2020

7.6

2009

7.6

1954

6.1

2010

7.8

1995

7.7

2004

7.1

1999

7.0

1983

8.1