2000

7.2

1987

7.5

1955

7.2

1949

7.7

2012

4.5

1953

6.8

1986

6.8

1999

5.6

1968

6.6

1976

7.5

1980

6.1

2006

5.5

1989

6.5

2004

6.8

1969

7.9

1954

7.2

1983

6.7

1970

6.3

2012

6.9

1947

7.5