1995

6.9

2003

6.7

2020

0.0

2007

5.6

2014

7.0

2017

6.8

1999

6.9

1997

5.1

2006

6.6

1998

6.8

2001

5.4

1994

6.0

1977

6.5

1990

5.7

1946

6.4

2005

7.0

2009

8.2

2007

5.5

2001

6.5

1991

5.9