2008

6.8

1992

5.0

2009

3.5

1991

5.8

2010

4.5

1989

6.0

2004

3.8

1999

5.4

1977

4.1

2018

5.8

2012

6.3

2011

3.4

2011

5.1

2019

6.1

1998

5.8

2009

6.0

2015

4.6

2017

6.7

1997

7.6

2002

6.4