2010

6.8

1960

8.4

2009

7.6

1964

8.1

2002

7.3

1957

8.3

2000

8.2

1968

6.7

1962

8.0

1986

7.5

1993

8.6

2001

7.8

1991

8.3

1980

6.3

1990

7.0

2012

6.9

2002

8.0

1966

8.0

1965

6.8

2012

7.1