1996

6.5

2015

7.1

2015

5.0

2003

6.7

2011

4.2

1984

6.9

2005

5.7

1992

5.5

2007

6.0

1994

7.0

1995

6.0

2013

7.1

1970

6.1

2015

6.1

2001

6.0