1991

5.3

2002

6.8

1993

5.5

1997

7.6

2013

6.8

1964

7.4

1995

7.3

2010

7.8

2006

7.9

2009

5.5

1984

7.1

2011

5.0

1965

7.1

1944

7.4

1982

7.9

2012

7.2

1997

4.4

2004

6.8

1998

6.0

2003

6.5