2008

6.5

2008

6.1

1980

5.6

2002

7.0

1981

6.7

1986

7.0

2002

3.7

1993

6.2

1991

6.1

1990

6.7

1996

5.5

1991

6.2

1992

6.3

2002

6.6

2003

5.7

1994

5.2

1994

6.7

2003

6.3

2001

6.3

1996

6.5