1993

6.5

2017

6.1

1996

6.5

2020

6.5

2016

6.7

2006

6.7

2003

6.3

1999

6.8

1993

6.5

1975

6.3

1965

6.4

2000

7.3

1980

6.9

2011

6.6

2003

6.8

2001

6.8

1974

6.6

1980

5.9

1988

6.5

2013

7.5