2002

6.2

2014

5.2

2008

6.8

2000

7.4

2004

5.4

1992

5.0

2010

4.5

1989

6.0

2004

3.5

2012

6.3

1998

5.8

2011

3.3

1991

5.5

1999

5.1

2018

5.7

2011

5.1

1977

3.8

2019

5.8

2015

4.4

2017

6.7