1988

7.2

2017

7.9

2004

6.5

1996

7.8

1966

6.2

2003

5.1

1997

6.8

1991

7.1

2002

4.4

1996

7.4

1974

6.6

1922

7.6

2006

5.2

1976

4.5

1985

7.1

1990

5.8

1986

7.4

2001

7.1

2000

7.8

1987

7.1