1990

0.0

2001

7.8

1996

6.4

1997

7.2

2006

7.1

2007

6.5

1998

8.2

2015

8.3

2000

7.6

2004

7.9

1993

3.5

2004

4.9

1989

7.3

1988

6.0

1987

5.0

2003

7.6

2006

0.0

2012

6.7

1999

8.3

1986

4.7