1986

7.2

1989

6.0

1988

6.2

1991

5.3

2010

6.4

1946

5.8

1956

5.1

2012

7.0

1990

7.5

1993

7.8

1996

7.6

1970

7.3

1973

7.0

1975

7.0

1978

7.0

1979

7.2

1984

7.4

1987

7.4

1995

6.6

1989

5.7