1964

7.0

1961

8.3

1989

6.7

1999

5.1

2011

4.6

1966

7.3

1970

7.3

2001

6.0

1997

5.0

1969

6.7

1945

7.6

2014

6.7

1972

7.7

2016

6.6

1994

7.8

1979

6.3

2006

6.5

1971

7.3

2010

5.7

2007

5.0