2005

6.3

2002

6.3

1988

5.0

2001

6.8

1997

6.7

1995

5.9

2013

4.9

2014

6.5

2016

4.7

1956

8.2

1990

7.2

2003

7.4

2002

6.6

2006

5.8

1992

3.8

1988

6.3

2004

6.4

2013

5.7

2013

6.0

1999

7.1