1998

7.1

1993

6.0

1999

5.7

1986

6.4

1989

6.2

1987

5.3

1982

5.2

1993

8.1

1986

4.7

1997

5.3

1996

6.5

1988

6.6

2006

5.3

1985

5.3

2001

6.5

1987

6.5

1974

6.1

1994

6.6

2001

6.5

2000

6.4