1997

5.3

2008

4.9

1995

5.6

1997

4.1

1992

4.6

2011

4.8

1991

3.7

1993

6.9

1990

6.1

1991

6.1

1983

4.3

1995

3.4

1985

0.0

1996

4.1

1991

4.1

2007

6.9