1993

7.9

2006

7.7

1994

8.4

2004

8.0

2012

8.6

1964

7.9

2009

7.9

1973

7.0

2008

8.9

2007

8.1

1997

8.3

2020

7.5

1966

7.6

2010

8.5

2000

6.8

2013

7.1

1993

7.0

1963

5.7

2013

8.1

1969

6.7