1995

7.7

1983

7.3

2006

7.0

2002

6.9

1995

7.0

2002

6.3

1965

6.9

1943

5.4

1989

8.0

1974

8.5

1990

6.7

2001

6.1

2008

6.8

2007

6.7

2003

6.0

2004

7.9

1977

7.1

1997

8.4

1944

6.8

1990

9.0