1973

2.3

1995

3.0

1985

6.4

1980

7.0

1985

4.1

1984

6.7

1964

7.1

1997

10.0

1979

6.8

1981

6.6

1990

7.0

1998

5.8

1977

7.5

1982

7.0

2001

7.2

1982

6.2

1994

6.0