2002

6.4

2000

7.4

1987

6.6

2010

4.5

2008

6.8

1992

5.0

1989

6.0

2004

3.8

1999

5.4

2007

3.8

2011

5.3

1977

4.1

2009

3.5

1952

5.7

1991

5.8

2011

3.4

1998

5.8

2012

6.3

2018

5.7

1974

0.0