1994

6.2

1998

6.0

2010

5.8

1988

6.4

2003

6.8

2019

6.5

1996

7.8

2006

6.1

2009

5.7

1978

5.9

2011

6.4

1974

6.0

2025

7.9

1991

6.2

2021

6.4

2012

5.4

2000

5.5

1969

7.6

1996

6.3

2013

6.1