2002

6.4

2016

5.2

2007

7.1

2013

6.4

2020

6.8

2019

4.0

2018

6.2

1991

5.8

1992

5.0

2009

5.3

2017

4.3

2003

4.6

1959

4.3

1994

6.3

2004

3.8

1989

6.0

2015

5.7

2008

6.8

1998

5.8

2011

7.0