1988

6.3

1992

6.3

2010

7.1

1990

6.1

2010

8.4

2017

7.8

1994

6.0

1995

6.3

1997

4.3

1989

5.8

1985

6.5

2008

6.5

2009

5.7

1988

6.3

2006

6.1

1993

6.0

1984

5.3

2003

6.8

2005

5.8

2004

6.4