1984

6.5

1994

6.3

1977

6.6

1971

6.7

1972

6.8

1973

6.8

1988

6.2

1997

7.5

1993

5.3

1951

7.2

2006

6.6

2006

5.8

1969

6.8

2016

7.3

1958

4.9

2003

0.0

2013

5.9

2005

10.0

2009

0.0

1956

0.0