2007

5.3

2010

6.8

2002

5.6

1998

6.4

1997

6.3

2005

5.4

1977

7.2

1986

6.9

1991

4.7

1994

4.8

2012

0.0

2008

4.7

2000

4.8

2009

6.5

1943

0.0

2014

3.1

1999

6.7

1990

7.3

2006

5.1

1984

6.2