1938

7.0

1993

6.5

1996

6.2

1958

6.4

2007

6.7

2006

6.0

2003

6.5

1995

5.4

2003

6.2

1948

7.5

1986

6.2

1993

6.8

2005

6.6

2004

6.8

1997

6.3

1999

6.6

1993

6.2

1978

4.1

1990

6.1

2005

5.5