1995

5.9

2010

5.9

1999

5.7

2009

7.8

2016

5.0

2016

8.6

2012

6.0

2013

5.2

1972

6.4

2006

5.3

1987

5.3

2003

5.9

1992

5.8

1996

6.4

1994

4.5

2002

6.3

1988

5.0

1962

7.7

2003

7.2

1997

6.7