2009

7.4

1975

6.9

1979

7.0

2015

8.1

2001

5.2

1993

7.3

1961

7.4

1985

8.3

1989

6.2

1992

5.5

1964

7.0

1963

6.5

1983

5.9

1984

7.2

1982

4.4

1983

7.0

2010

6.7

1987

6.8

1995

6.5

1956

7.1