1983

5.1

2020

6.1

2018

6.0

2014

8.5

2012

9.3

2015

6.7

2014

7.0

2005

9.7

2016

9.3

2000

7.1

2009

8.5

1984

7.2

2000

5.9

2017

7.8

1998

9.3

1993

5.7

1975

4.5

1988

6.0

1990

4.7