1941

7.3

2003

6.3

1962

7.7

2006

7.0

1955

6.3

2009

5.0

2008

5.9

1989

7.3

2007

6.0

2010

5.6

2002

5.2

2013

6.4

1994

6.5

1960

7.0

1967

6.5

1982

6.6

2009

5.8

2015

6.2

1972

7.4

2013

8.0