1967

5.5

1982

7.6

2009

5.4

2006

6.7

1953

6.9

1981

6.6

1961

7.4

1995

5.1

1955

6.9

1958

7.5

2015

7.3

1959

7.0

2006

6.5

2010

7.3

2006

5.0

2019

8.3

1973

7.0

1951

7.1

2020

6.5

1949

7.2