2004

4.8

2006

5.7

1995

6.5

1991

7.6

1987

7.1

1990

6.6

1988

4.9

1942

5.8

1969

6.3

1943

6.2

1939

6.7

1957

6.8

1944

6.0

1967

6.5

1974

7.5

1955

7.9

1971

5.5

1964

6.1

1958

6.6

2000

4.8