2006

7.4

1996

7.5

2007

6.7

1993

8.0

2018

5.9

1994

7.8

1988

5.7

1999

7.5

1988

4.6

1990

7.4

1999

7.9

1992

6.7

1986

7.2

1991

0.0

1986

5.8

1989

8.3

1984

6.3

2001

5.7

1977

5.0

1989

6.4