2001

6.6

1993

7.3

2002

6.2

2001

6.8

1978

6.3

1988

6.2

1994

6.6

2001

5.7

1991

6.6

1996

6.0

2000

6.8

1986

6.2

1973

6.4

1975

6.1

1978

6.1

1996

5.9

2001

5.9

1994

8.0

2004

7.2

1999

6.8