1989

5.9

2011

6.5

2013

5.5

2003

6.1

1990

6.0

1991

4.7

1988

6.3

1995

5.4

2009

5.8

2008

6.7

2010

6.6

1962

7.8

2004

7.1

2007

7.2

2013

6.4

1990

6.1

2001

6.2

2007

6.1

1986

6.0

2009

5.4