1963

7.4

1954

8.5

1987

7.5

1989

8.2

2005

5.1

2006

5.9

1966

7.1

1972

6.6

1953

3.5

2004

5.6

1996

6.2

1997

7.5

2009

7.8

2002

5.8

1953

7.2

1970

6.0

2005

6.3

1991

7.1

1960

7.8

1994

8.0