2008

6.3

2006

5.1

2002

7.7

2002

5.3

2008

6.1

2006

6.5

2007

5.7

1996

5.6

2006

6.3

2004

6.6

1990

5.5

1967

0.0

1992

6.8

1986

7.6

2004

6.3

2001

6.9

2003

6.3

1998

7.0

2002

5.6

1989

6.3