2003

5.6

1994

5.0

2018

5.2

2017

7.5

2002

6.7

1997

4.3

2014

3.9

2016

0.0

1991

5.2

1984

6.3

1975

0.0

1999

7.2

1992

7.0

2011

5.1

2008

6.0

2002

7.8