1959

8.4

2015

6.9

2020

6.7

1989

7.8

1997

6.9

2002

7.9

1984

7.5

2006

5.4

2000

8.5

2023

7.4

2018

7.7

2013

7.7

2012

8.6

2011

8.3

2014

8.4

2010

7.8

2001

7.8

2009

7.6

2008

7.7

1987

7.7