1972

8.6

1985

6.7

1980

6.8

1989

8.2

1973

6.9

1982

7.1

1984

6.5

1982

4.5

1995

6.2

1985

7.5

2010

7.0

1984

8.1

1958

6.7

1990

6.8

1974

7.6

2009

7.3

1997

6.5

2014

6.6

1950

0.0

1990

6.0