1971

6.4

2003

1.0

1991

5.8

1984

5.9

1990

7.4

1989

6.8

1951

5.0

1982

7.1

1982

7.1

1981

6.7

1973

7.0

2001

7.5

1972

0.0

1954

3.7

1969

3.0