2006

6.5

1990

6.7

1995

6.8

2002

6.1

1988

6.3

1994

5.8

1996

5.7

1988

6.1

1996

6.2

2007

6.1

1993

6.7

1988

6.1

2003

6.6

2003

6.8

2008

6.4

1995

6.9

1997

5.7

2004

6.4

2017

3.9

2003

6.7