1972

7.8

1986

8.0

1979

6.2

1987

6.8

2009

5.9

1960

3.8

1950

4.8

2002

5.6

2015

7.7

1992

6.4

1961

5.9

1969

6.2

1982

7.4

2009

4.1

1959

4.9

1966

5.3

1958

5.9

1989

7.7

1958

5.1

1950

5.9