2004

7.3

1964

7.3

1999

6.3

2011

6.5

2008

6.6

2004

6.7

1988

6.3

1986

6.3

2012

6.3

1984

6.1

2011

6.9

1996

6.4

1992

6.4

2012

6.2

2011

5.0

2000

6.8

2001

6.2

1967

6.6

1976

7.7

1978

7.0