1968

5.8

1961

7.5

2004

6.3

1980

6.6

1982

6.4

1994

6.8

2002

6.7

1979

7.0

2004

6.8

2005

5.9

2016

4.6

2005

6.2

2002

7.1

2003

6.6

2007

5.3

1997

6.5

2006

6.5

2004

4.9

2008

6.5

2003

5.7