2011

5.4

2017

7.4

2000

6.9

2010

5.2

2009

6.7

2002

7.4

2015

7.5

1997

7.2

2014

8.5

2018

7.5

2017

6.7

2003

7.8

2009

7.6

2017

7.6

1980

8.2

2019

8.1

2015

7.3

2000

6.6

1998

8.1

2012

6.0