2004

5.8

1994

6.2

2010

7.8

1996

5.8

1959

6.9

2010

5.7

1997

7.9

2013

6.5

1989

5.5

2003

5.8

2011

6.9

1999

7.6

2009

4.8

2012

7.4

1995

5.6

1980

6.2

1990

6.1

1961

7.2

2008

5.1

2001

6.4