1990

6.1

1989

9.3

2013

7.5

2002

6.5

2018

5.3

2003

6.6

2000

5.2

1994

7.4

2016

5.6

2001

6.8

2001

5.2

1977

6.7

2004

6.8

2004

6.0

2010

4.8

2003

5.3

2006

6.6

2009

5.4

2018

6.9

2016

6.4