1991

8.5

2016

7.4

2003

4.6

2011

8.5

2004

4.6

1985

0.0

1994

7.1

2008

7.8

2001

5.7

2005

6.7

2000

3.5

1994

0.0

1994

8.4

1999

6.3

1995

7.8

1989

0.0

1989

5.0

1987

6.0

1998

7.0