1973

6.9

1982

7.1

2009

7.3

2002

8.0

2010

7.0

1984

8.1

1958

6.7

1990

6.8

1974

7.6

1989

8.2

1972

8.6

1995

6.2

1985

7.5

1985

6.7

1980

6.8

1984

6.5

1982

4.5

1950

0.0

1982

4.0

2008

5.0