1950

7.5

2011

5.7

1989

5.1

1966

8.0

2017

7.3

2011

5.1

1970

7.6

2002

7.2

1979

6.3

1974

6.6

1961

6.4

1994

4.6

1962

7.9

1963

6.9

2002

6.9

1992

5.4

1990

6.0

1960

7.7

1963

7.5

2015

6.8