1986

6.5

1996

6.4

1994

8.0

1990

7.3

1994

2.2

1998

8.2

2008

6.8

1993

5.9

2001

4.0

2002

6.0

1984

7.1

2004

7.0

1995

7.3

1999

7.5

1979

6.7

1986

7.0

1987

5.4

2013

7.1

2005

7.7

1994

7.6

2003

7.6

2004

5.0

1995

0.0

2009

3.6

1993

7.9

2002

6.8

1985

7.7

2000

6.8

2001

6.9

2009

4.9

1975

7.3

1987

6.0

2019

5.0

1999

8.3

2001

4.3

2003

6.0

1987

6.4