1954

7.2

1957

7.2

1955

7.3

1955

7.2

1959

7.8

1964

1.0

1972

0.0

1972

0.0

1950

8.1

1963

7.5

1967

6.8

1990

6.9

1951

5.2

2017

6.5

2000

8.2

1989

5.4

1950

8.1

1967

6.5

1985

7.0

2007

6.1