1968

6.9

1986

6.1

1970

6.4

1982

5.8

2016

6.8

1966

6.8

1972

6.3

1964

8.1

1932

7.8

1969

5.4

1997

6.9

1967

6.2

2004

6.9

1995

6.7

1973

7.7

1966

6.4

1999

9.1

1993

6.1

1988

6.2

1992

8.9