1987

7.2

2003

5.9

2006

5.9

1998

5.8

1999

4.1

1990

10.0

1996

6.7

1993

0.0

1992

7.4

2007

6.4

2003

2.5

1985

7.7

1990

6.1

1996

7.7

1993

4.9

1999

6.1

1994

6.5

1992

6.2

2004

7.2

2002

5.7

2005

4.5

1972

6.2

2017

5.4

1993

6.2

1996

7.1

1993

8.4

2009

6.3

2009

7.3

1993

5.8