2004

7.9

2002

6.1

2007

5.9

1970

6.0

2017

7.5

2013

6.1

2020

6.6

2014

5.6

2008

6.4

1995

7.0

2005

5.7

1989

6.3

2008

5.9

2010

6.2

2008

5.5

1992

6.8

1980

7.3

1986

6.7

2006

5.5

1996

7.2