2006

6.6

1982

5.4

2000

6.4

1970

6.9

2010

6.7

1951

7.4

2000

5.5

2003

6.0

2001

6.1

1993

6.6

1993

7.2

1998

6.8

2002

6.3

1955

7.2

1987

6.7

1948

7.9

2000

6.6

1990

6.0

2002

4.5

1949

7.7