2009

6.5

1980

6.3

2002

6.1

1989

6.0

1997

5.3

2019

5.5

2004

6.2

2004

7.2

1996

5.5

1999

6.8

2004

5.7

1994

6.2

1985

6.2

1987

4.1

2005

6.6

2008

5.6

2005

5.8

1982

6.8

1996

6.8

2000

6.4