2003

7.3

1996

6.9

1990

6.1

1990

6.5

1954

6.7

1966

7.8

1976

7.5

1985

7.2

1988

6.2

2008

7.9

2010

7.2

1996

5.8

2006

5.4

2002

5.2

1993

5.8

1997

7.4

1975

6.4

1988

6.4

1989

5.5

1988

6.5