1955

6.0

1965

7.5

1968

7.2

2002

6.2

1987

7.7

1991

6.3

1940

4.0

2006

5.3

1999

5.9

1996

6.7

1973

6.8

1969

5.1

1998

5.7

1967

6.0

1954

7.3

2002

6.9

2002

7.4

1937

6.6

1956

6.6

1998

7.2