1998

7.2

1984

5.9

1992

7.4

2006

6.6

1984

5.8

1973

6.9

1943

6.2

1974

7.5

1971

5.5

1971

4.6

1970

5.8

1966

6.4

1965

6.7

1973

3.1

1981

3.3

1965

4.6

1986

4.5

1990

4.8

2007

6.0

1980

6.3