1976

7.0

2006

6.5

1981

6.1

1987

5.6

2013

7.1

2008

7.5

1983

5.0

2001

7.3

1971

7.6

1981

4.2

1979

5.3

2009

5.9

2002

5.9

2009

6.5

2023

6.6

1952

7.3

1961

6.6

1959

5.4

2015

4.9

2003

6.0