1994

6.7

2015

6.9

1975

6.4

2003

6.0

2018

6.9

2009

6.0

2016

6.6

2020

5.7

2012

7.8

2012

4.0

1996

9.5

1971

5.1

2011

5.6

1975

7.3

2011

6.4

1990

4.8

2014

4.5

2016

6.7

2013

5.7

2014

1.0