2004

6.6

1969

5.6

1953

4.9

1975

6.8

1968

6.4

1975

4.3

1964

6.2

1965

6.1

1966

6.1

1970

7.5

1990

6.5

1985

5.4

2001

6.8

1985

6.2

1995

6.9

1966

5.6

1986

4.7

1964

6.3

1994

6.9

1994

6.2