1969

7.1

1997

7.5

1961

7.2

2004

4.6

1984

5.4

2006

7.7

1991

6.7

1993

6.6

1997

5.0

1964

7.3

2006

5.8

2006

5.5

2000

3.6

1986

7.0

1978

6.3

2007

4.5

2006

0.0

1952

7.7

1987

7.2

2000

7.2