1997

5.3

1992

6.4

1989

8.1

1978

7.7

2001

0.0

1999

7.5

1999

0.0

1996

7.5

1982

6.0

1984

5.0

1979

3.5

2003

7.1

1986

7.3

1994

6.0

1997

7.5

1991

6.8

1993

6.1

1994

8.3

1970

6.3

1969

6.0

2001

6.5

1973

6.8

1972

5.8