2001

7.5

2007

6.5

1984

7.7

2000

7.4

1992

8.1

1999

8.5

1996

8.0

1977

7.3

2009

7.3

1994

6.5

2004

7.9

2011

6.7

1995

8.1

2011

7.5

2009

6.5

1979

7.6

2000

8.0

1999

7.4

1963

7.1