2002

6.4

2004

3.8

1998

5.8

1992

5.0

1977

4.1

2017

6.7

1989

6.0

2008

6.8

1991

5.8

2011

5.1

1989

9.0

2015

4.6

2009

6.0

2014

4.5

1983

5.0

1917

1.0

1910

4.0

1994

0.0

1926

0.0