1981

7.2

2016

5.2

2008

4.4

1996

6.7

1999

6.2

2000

0.0

1976

7.6

2005

6.5

1997

6.5

1994

6.5

1991

6.7

1996

6.2

2004

7.8

1990

7.7

1982

6.7

2012

7.8

1984

5.3

1957

5.7

1987

5.2

1971

7.0