2017

6.7

1997

7.6

2000

7.4

2002

6.3

2004

3.8

1989

6.0

1999

5.4

2008

6.8

1991

5.6

1992

4.9

2010

4.5

2011

3.4

1998

5.8

1977

4.1

2018

5.8

2009

3.5

2011

5.0

2024

6.0

2012

6.3

2009

6.0