1997

6.6

1990

4.8

1995

8.0

1999

6.0

1998

7.2

1988

7.2

1971

5.9

1993

7.0

1990

6.3

1985

6.8

2004

0.0

1993

5.7

2015

5.7

1988

8.3

1996

3.9