2001

4.1

2003

4.0

2009

5.1

2005

5.2

2017

6.7

2015

5.6

1987

5.8

2009

5.5

1970

6.4

1998

6.2

1968

6.7

2019

4.1

2010

4.0

2008

2.3

2004

5.0

2021

9.0

1956

6.8

2021

0.0

0.0

0.0