1992

5.8

2017

6.8

1998

7.2

2007

8.5

2001

6.6

2011

8.5

2004

8.6

2003

7.9

1993

6.6

1976

7.0

2014

7.3

2002

5.2

2019

6.7

2008

7.4

2020

7.9

5.8

2003

8.2

2020

7.6

1985

6.5

2013

8.6