1996

5.8

2003

6.1

1991

4.5

1989

6.3

2005

4.3

2010

6.7

2018

5.4

2006

7.9

1986

6.5

1997

6.0

1997

8.3

2005

8.3

2004

7.2

1995

7.7

2007

6.6

1985

0.0