1989

7.8

2010

6.6

2011

7.1

2002

9.5

2013

6.7

2008

7.6

1939

7.9

1985

6.2

1970

8.2

1962

7.9

2011

5.5

1967

7.7

2010

6.7

1994

6.5

1968

6.4

2006

7.0

2020

6.0

2014

6.8

1972

7.3

1966

6.5