2007

6.5

1991

3.6

1971

8.1

1989

3.8

1994

7.8

1990

7.4

1992

2.5

1979

6.7

1999

7.2

1984

7.5

1996

5.8

1996

6.9

1993

6.7

1997

4.0

1997

5.2

1991

2.5