1994

5.8

1987

6.0

1998

7.2

1994

6.7

1988

2.8

2004

7.1

2002

6.6

2002

7.1

1997

6.7

2002

6.4

2007

4.6

2000

5.5

1989

6.2

1991

6.5

2001

6.6

1987

6.8

2002

6.8

1983

7.4

1985

6.6

1947

7.4