1956

7.7

2006

7.6

1960

6.6

1966

6.3

1992

6.3

2007

5.7

1990

7.8

1970

5.2

1969

5.6

1965

6.3

1968

4.2

1963

6.8

1964

6.6

1960

6.3

1970

7.5

1961

7.3

1975

6.3

1965

6.0

1962

7.0

1950

0.0