1976

8.1

1996

7.5

2020

5.9

1970

7.1

1979

7.0

2009

7.2

2017

5.8

2017

7.6

1972

7.1

1972

7.8

1998

7.2

2006

6.8

1981

2.8

1978

6.6

2023

6.9

1991

7.4

2002

7.3

2001

7.4

2014

6.2

2007

5.1