1986

7.3

1993

7.4

2005

6.9

2002

7.4

1985

6.9

1986

7.1

1978

8.0

1927

8.1

1961

7.1

2017

6.0

1971

7.7

1964

7.9

1965

6.8

1990

6.7

1976

7.3

1939

7.5

1992

8.9

6.4

1968

6.9

1975

7.8