2013

7.2

1988

6.0

2009

5.6

2012

6.9

1990

7.5

1996

6.8

2008

5.5

1964

7.0

1960

7.8

1941

7.3

2007

5.7

1968

6.6

2012

6.0

2001

6.2

2010

7.1

2008

7.1

2016

7.3

1997

7.6

1982

7.6

2008

7.8