1986

7.6

1995

8.4

1997

6.6

1951

7.7

1947

7.6

2002

5.3

2001

6.3

1997

7.8

1978

7.2

1982

6.5

1966

6.4

2003

3.3

1973

4.0

1943

6.9

1983

7.1

1971

6.8

1954

8.0

1990

7.5

1995

7.9

1941

7.7