1992

6.8

1998

8.7

1999

7.4

2020

7.6

1998

8.2

2019

8.7

2012

8.6

2011

7.6

2009

7.4

2001

8.1

2023

8.2

1998

7.1

2015

7.1

2019

7.0

2009

5.9

1990

7.3

1977

7.7

2010

8.0

2016

7.2

2013

7.5