1998

6.6

1955

6.0

1984

6.2

2004

7.2

2012

5.3

2018

6.1

2017

8.0

2018

6.2

2005

4.3

1997

5.3

2015

7.1

1983

5.0

1996

6.7

1994

5.1

2007

4.0

2006

5.1

1987

5.3

2009

5.6

1982

5.8

2000

6.3