1993

8.1

1997

6.6

2020

5.9

1992

6.8

1975

6.9

2010

8.1

2002

7.2

1969

8.2

2013

6.1

1994

6.5

2004

8.9

2021

7.0

2012

6.8

2009

7.7

1981

7.4

1979

8.0

2003

8.0

2020

7.7

2004

7.5