1996

6.8

2009

8.1

2013

3.8

1979

7.3

2002

7.0

1994

6.3

2008

7.5

1974

5.1

2012

6.2

2023

6.0

1978

4.3

1968

5.0

2019

7.7

2018

1.0

1993

7.2

1981

5.1

2010

6.4

2007

6.5

2011

6.7

2002

5.3