1955

7.2

2006

7.8

1964

7.3

2007

6.2

2005

7.3

2013

5.9

1966

6.8

1984

6.5

1983

6.1

1986

7.1

1972

6.2

2013

7.0

2009

6.0

2012

6.9

2013

6.4

1944

7.1

2017

5.9

2007

6.5

2002

6.0

2013

5.9