1998

4.8

1990

6.1

1994

4.6

2004

5.5

1990

5.1

1990

2.6

1991

4.7

1992

5.8

2010

7.0

1989

6.7

1988

6.3

1996

3.9

1995

7.7

1990

7.0

1991

5.3