2015

6.1

1968

6.5

2020

7.3

1993

6.8

1980

6.2

2015

5.6

2011

4.8

1970

6.4

1967

6.9

1961

6.7

1958

7.5

2011

7.1

1956

7.6

2006

5.8

1959

8.2

1969

7.3

1949

6.8

1949

7.5

2007

6.5

1962

6.6