1996

6.4

1979

7.8

2001

7.7

1980

7.3

1997

6.6

1999

6.3

2002

6.0

2005

7.1

2013

4.2

1970

7.6

2007

5.7

2006

4.2

1982

6.6

1990

4.0

1991

6.6

2004

0.0

1938

6.0

1993

6.5

2001

6.8

1993

6.6