1982

7.6

1999

5.0

2003

4.1

1994

6.3

1994

7.8

1994

8.4

1997

6.7

1996

5.4

2009

8.0

1991

7.8

1996

7.8

1989

8.3

1995

6.6

1993

6.7

1998

7.1

1992

7.7

1999

8.3

1994

4.8

2005

7.5