1984

7.4

1983

5.2

2005

7.4

2002

8.2

1995

7.6

1994

7.5

2010

10.0

2006

7.1

1992

7.1

1990

7.1

2001

8.0

1999

7.7

1987

7.3

1986

4.0

1999

7.1

6.7

1993

7.7

2006

6.1

2000

6.2

1992

5.3