1930

7.5

1980

8.4

2009

6.1

2003

6.2

2012

6.6

1991

8.1

2013

7.7

2003

6.8

1943

8.2

2005

5.8

2002

7.1

1983

5.5

2008

7.4

2007

7.0

2016

7.5

1987

7.5

1987

7.3

2006

5.8

1990

7.4

2004

6.6