2001

7.3

2013

8.5

1988

6.3

1979

7.2

2002

6.8

1980

6.0

2005

5.3

2003

5.9

1984

6.5

1964

7.1

1992

7.4

2016

3.3

1996

6.4

2005

6.3

1970

7.2

2005

4.0

1994

7.5

1980

6.6

2010

3.9

2014

6.7