2012

6.4

2014

7.6

2013

6.8

1990

5.5

2007

6.5

2015

7.3

1995

6.2

2001

6.7

1971

7.4

2010

6.2

2010

6.0

1993

6.5

1941

7.0

2012

6.3

1990

6.9

1999

6.3

1984

7.5

1982

6.8

2002

6.8

2004

5.7