1994

6.2

2010

5.2

1991

6.3

2018

6.8

1996

6.3

1992

6.5

1995

5.8

1998

6.0

2001

6.9

2011

6.6

2002

6.7

2017

6.1

2006

6.5

1979

7.3

2023

6.3

2015

6.3

2011

6.5

2015

7.3

1998

6.2

2009

5.6