2005

6.7

2004

6.6

1964

6.5

1973

6.1

1980

4.9

2000

5.5

1986

5.0

2016

5.4

1981

6.3

1986

6.7

2006

5.8

2002

7.0

2009

4.8

1996

6.5

2009

6.9

2005

4.6

1976

5.6

2000

6.4

1988

5.2

2010

5.5