1999

7.4

2003

7.6

2006

8.2

2008

7.7

2012

6.7

1969

7.0

1990

8.1

2016

7.1

2004

7.6

1975

7.3

2008

5.9

2015

6.7

2011

8.3

1999

8.2

2013

8.7

2022

7.2

2021

8.0

2014

7.9

2002

8.6

2004

7.1