1999

5.4

2003

5.3

2000

5.5

2014

6.0

2010

5.9

1992

5.0

1998

5.9

2021

4.0

1981

4.9

2003

4.9

2005

5.2

1968

1.0

2023

0.0

2013

4.7

2009

5.9

2013

5.3

1994

8.5

0.0

2014

0.0

1977

4.6