2001

6.5

1987

6.5

1994

6.8

2003

6.9

1996

7.3

2003

5.1

1986

6.1

2001

7.6

2000

6.7

2001

5.6

1992

7.0

2000

6.8

1990

7.8

1994

7.9

2013

8.0

2003

6.6

2004

6.2

1981

6.5

1993

6.3

1992

6.4