1991

2.5

2014

4.3

1999

7.9

1998

3.8

1989

6.9

2004

7.3

1996

6.0

1981

4.1

1995

1.0

2005

9.0

0.0

1996

1.0

1979

6.8

1990

5.5

2000

3.0

1996

4.5

2008

4.8

2007

5.0

1998

5.2