1994

4.7

2020

6.9

1996

6.4

2013

6.6

2016

7.9

1982

5.4

2009

7.3

1972

7.8

2012

7.6

2015

7.6

1978

7.5

2017

6.5

2006

7.4

2020

5.9

2014

6.6

1968

5.7

1999

6.8

2015

7.2

1998

7.8

1983

7.4