2016

6.6

1999

8.2

2006

8.2

1994

8.5

1989

7.8

2001

7.5

1957

8.5

1994

8.7

1993

8.6

1989

8.3

1998

8.1

1996

7.9

1972

8.7

1985

8.3

2013

8.0

2010

7.8

2000

8.2

2014

8.0

1995

8.4

2008

7.7