1994

8.4

1975

7.1

1976

8.0

2008

6.7

1959

7.5

1999

8.2

2001

8.0

1972

7.9

1966

7.3

1993

5.6

1993

7.1

2002

8.6

1989

8.2

2014

7.7

2009

7.9

2014

7.7

1980

7.3

2000

6.8

1986

8.4

2004

8.4