1991

7.6

1993

7.0

2012

6.7

2017

7.5

1982

7.6

2009

5.8

2007

7.4

1978

7.2

1979

6.8

1998

6.8

2024

8.5

2011

7.5

1973

7.6

1983

8.0

2014

8.6

2015

6.9

2018

7.3

2006

8.6

1981

7.3

1966

8.0