1997

7.6

2017

6.7

2000

7.4

2002

6.4

1992

4.9

2004

3.8

2024

6.0

2010

4.5

2008

6.8

1999

5.4

1989

6.0

1991

5.6

2011

5.0

2009

3.5

1998

5.8

1977

4.1

2018

5.8

2012

6.3

2011

3.4

2006

0.0