1979

3.5

1995

7.2

1980

5.3

1981

5.4

1962

8.0

1962

6.9

1952

5.9

2008

6.7

2009

6.8

1963

5.1

1967

5.0

1967

4.1

1961

5.0

1962

7.0

1981

5.9

1964

6.0

1950

4.6

1951

5.3

1952

5.2

1954

4.2