1987

7.1

1994

5.6

1992

4.9

1993

4.2

1990

7.4

2000

7.7

1998

8.2

2005

6.1

2004

7.2

2002

7.7

1998

5.4

1989

6.6

1994

7.8

2005

8.2

1990

5.5

1992

4.2

1999

7.3

2004

6.2

2003

7.6

1984

7.3

1994

7.0

1989

5.1

1989

8.0

2012

7.2

1989

8.3

2011

8.2

1998

5.6

1991

7.0

1996

5.0

1994

5.0

2010

6.9

1985

7.6

1992

4.4

2007

7.0

1999

8.3

2001

4.5

1990

4.9