2000

7.1

2006

6.1

1985

5.3

2005

8.8

1993

6.5

1992

6.8

2000

6.2

1993

8.0

2004

8.3

2004

8.6

1990

8.6

2003

7.6

1977

7.3

2006

7.5

2004

7.4

2003

6.7

2005

4.5

1986

3.0

1987

7.7

2012

8.0