1991

2.4

2014

4.3

1999

7.9

1998

3.8

2004

7.3

1996

0.0

1981

4.0

1995

1.0

2005

0.0

0.0

1996

1.0

1990

5.4

2000

3.0

1996

4.5

2008

4.8

2007

5.0

1998

5.2