1986

5.4

2000

7.5

2006

4.9

1996

7.7

1997

8.3

1999

3.8

2004

7.2

1984

7.2

2013

6.0

1995

7.8

1993

8.4

2002

5.0

1984

6.9

1994

6.0

2002

7.3