2011

8.1

2004

8.6

2008

7.8

1997

8.1

2001

6.6

1976

8.5

1977

7.3

2004

8.3

2003

8.2

1987

5.5

2016

7.6

2014

7.9

1996

5.3

5.8

2011

7.3

2005

7.6

2009

8.1

1998

7.1

1992

5.9

2020

7.5