1949

6.2

2009

6.0

1948

5.5

1990

6.4

1996

5.9

1988

4.9

1949

7.7

2006

6.1

1991

6.6

1996

7.0

2002

0.0

2006

7.0

1998

6.3

2004

6.1

1995

5.7

2008

6.4

1998

6.3

2006

4.7

2001

5.8

2002

6.7