1989

2.3

2004

4.9

1999

7.1

2001

7.8

1993

6.7

2005

7.0

2020

5.2

1964

6.4

2014

6.5

1954

6.3

2001

5.9

2008

6.3

2007

7.1

1985

6.1

2007

4.8

2005

6.8

2003

6.6

2017

5.6

2007

6.9

2012

6.0