2000

6.3

2020

7.0

1996

7.6

2004

6.0

2008

7.4

2010

6.9

2012

7.1

2016

7.0

1991

5.9

2007

5.6

2015

7.8

1986

6.8

2006

6.1

2004

6.6

1991

5.9

2016

7.4

2008

5.5

2025

5.5

2011

9.7

1967

6.7