1979

6.4

2008

10.0

1965

7.7

1988

7.8

1981

5.9

1994

8.2

2008

6.0

2000

7.5

1963

6.6

2006

5.8

1950

7.8

2003

6.7

2009

5.9

2004

0.0

1958

6.2

1957

6.1

2016

6.3

2014

6.5

2007

6.9

2018

10.0