2006

6.3

1985

6.2

1990

5.5

2003

6.3

2007

6.5

1998

6.8

2008

6.9

2007

6.5

1994

6.4

1987

6.1

2002

5.6

1997

4.8

2002

6.0

1993

7.2

2002

6.0

1995

5.9

1994

6.1

2006

6.7

2017

4.7

2021

9.0