1939

0.0

1986

7.6

1995

8.4

2006

7.0

1951

7.7

2005

6.9

1946

7.6

1968

7.2

1987

7.3

1989

7.0

1992

6.7

1998

6.6

1995

7.9

1941

7.7

1975

7.8

2002

7.2

1971

7.5

1963

5.0

1983

5.9

2006

6.1