2004

5.6

1987

7.3

1996

6.6

2002

7.0

2001

6.7

1999

6.8

1998

6.6

1993

5.5

2006

7.0

1977

3.3

1988

5.2

1972

7.0

2005

5.6

2001

7.4

1991

5.8

1989

7.0

1995

6.5

2003

6.4

1990

6.8

1973

7.2