1998

6.2

1983

7.4

1997

6.2

2003

5.8

1997

7.5

2004

5.7

1997

5.2

2002

6.0

2006

5.6

2005

5.8

1941

3.0

2003

6.0

1988

4.5

1990

5.8

2004

6.0

1942

3.5

1937

6.7

1996

7.0

2001

6.1

1986

5.6