2007

6.9

1999

7.0

1994

6.6

1990

7.4

1989

5.8

2019

7.1

2005

6.5

2006

5.0

2001

6.7

2007

6.4

2010

6.6

1997

4.7

2018

6.1

1979

6.0

2002

6.4

2011

6.3

2012

6.6

2010

6.8

2007

6.4

2010

6.3