2012

9.3

1996

8.1

1999

7.8

2006

8.3

1989

7.7

1997

7.1

1983

6.9

1995

7.2

2007

7.9

1973

7.2

1996

8.0

1995

7.7

1994

7.8

1997

6.9

1984

7.5

1965

7.3

1962

7.2

1998

7.2

1993

7.4

1964

7.9