1995

6.6

2000

6.5

1982

4.6

1993

5.5

1984

4.4

1987

6.8

1999

9.3

2003

8.0

1999

7.0

1984

7.3

1990

5.3

1990

6.1

1989

5.2

1987

6.8

1979

7.0

2009

6.0

2001

5.4

1986

7.7

2004

6.0