1998

6.0

1998

7.4

2006

5.3

1985

4.1

1977

6.9

2017

6.7

2003

5.9

2017

7.5

2001

5.6

2006

6.2

1998

6.9

1988

6.6

1999

7.3

2007

6.3

2012

6.4

1969

7.1

2012

6.8

2005

5.1

2004

5.5

2020

6.6