2007

9.0

2010

7.9

2014

10.0

1974

8.6

1999

5.9

2015

6.7

6.4

2021

7.8

2016

7.2

2010

7.2

1999

6.8

2013

7.6

1972

4.0

2000

5.9

1978

6.4

2008

4.4

1989

7.1

2009

8.6

2005

8.0

2017

4.6