1996

6.0

1986

7.7

1985

6.9

2000

5.7

2005

8.2

1993

7.1

2009

7.3

1981

5.6

1992

6.4

1987

5.6

1996

5.3

1997

10.0

1993

7.0

1989

0.0

2002

7.9

1989

8.0

2015

6.5

2002

5.1

1995

6.5

2009

7.6

1990

1.0

1990

6.9