2005

8.1

1996

6.4

2010

7.2

1995

7.9

1997

8.1

1986

7.7

2012

7.6

2020

7.8

1992

6.9

2011

7.8

1989

8.0

2001

7.6

1960

7.4

2009

5.9

2013

8.0

2019

7.4

2009

6.8

1994

6.8

1975

7.7

2012

6.8