1964

5.2

1971

6.6

1972

4.0

1979

6.9

1955

6.6

1993

8.1

1999

5.5

1987

6.3

1990

7.4

1972

0.0

1967

6.7

1993

1.0

1969

6.1

1986

4.3

1968

7.2

1980

6.5

2004

7.3

1985

6.7

1976

7.2

1981

2.3

1990

6.3

1973

6.3

1989

0.0