1997

6.1

1992

0.0

1996

6.4

2016

6.7

2001

7.3

1988

6.3

2002

6.8

2005

5.3

2005

4.0

2003

5.9

2021

7.0

1964

7.1

1970

7.2

2009

6.6

2016

3.3

2020

0.0

1980

6.6

2014

6.7

1996

6.5

2005

5.5