2002

5.8

5.7

1997

6.1

2004

7.8

1968

6.3

2010

6.4

2015

6.3

2002

5.6

2010

4.4

1994

6.3

1972

5.9

1976

7.5

1991

5.9

2012

5.8

1964

7.3

2016

5.2

2011

5.1

2013

7.6

1985

6.2

2005

5.6