1986

5.8

2015

6.7

2014

6.5

1998

6.2

2018

5.8

2012

9.4

2004

6.5

2005

9.7

2008

6.1

1999

7.3

2011

6.4

1988

5.5

2007

5.4

1997

6.6

1950

7.3

2015

6.2

2013

6.1

2001

5.2

2025

5.8