1949

6.8

1951

6.4

2005

7.6

2004

6.9

1947

6.7

1956

6.7

1951

7.1

1950

6.5

2005

6.7

1952

6.6

2012

7.3

1954

7.0

1950

6.6

1951

7.4

1950

6.9

1952

7.1

1943

6.2

1989

6.5

1946

7.2

1951

6.5

1954

6.8

1960

6.3

1948

6.5

1949

6.8

1950

6.5

1952

6.8

1955

7.2

1949

6.7

1953

6.8