1999

5.4

2001

4.4

2023

5.9

2012

5.5

2018

5.5

2017

5.8

2017

4.4

2016

4.2

1985

6.1

1997

6.0

1994

6.1

2005

7.0

1993

4.6

2007

7.5

1992

6.9

2013

6.8

2010

6.3

2015

5.4

1988

6.2

1976

7.3