2011

5.1

1977

3.8

2004

5.4

1992

5.0

2008

6.8

2002

6.2

1989

6.0

2004

3.5

1991

5.5

2015

4.4

1998

5.8

2009

5.3

2017

6.7

1983

6.5

2005

6.7

2005

6.5

2002

6.7

1998

6.6

1998

6.9