1998

6.9

2014

8.5

2018

7.5

2019

7.7

2020

8.1

2019

8.1

2018

6.9

2015

7.5

2016

7.9

2009

7.6

2015

7.3

2016

7.3

2002

7.1

2016

7.6

1994

8.7

2017

7.6

1980

8.2

2016

6.8

2003

7.8

2019

8.0