1983

7.1

2014

5.4

1987

5.3

1997

7.0

1977

6.6

2004

6.0

1986

5.8

1990

7.2

1979

6.8

2009

7.1

1984

6.5

2003

5.7

1962

7.8

1986

6.6

1989

5.9

1968

8.1

1898

6.0

1997

6.7

1991

7.5

1992

6.9