1986

5.6

1993

6.1

1990

7.4

2008

0.0

1988

7.3

2001

0.0

0.0

1995

6.7

1996

6.0

1985

4.5

2005

5.3

2002

5.7

1998

3.2

2010

6.3

1994

7.8