5.3

2007

5.7

2017

5.9

2011

5.6

1972

7.4

2002

7.8

1972

6.2

2003

7.2

1991

6.6

1989

5.8

2003

5.8

1988

6.2

2012

6.0

1977

6.4

2001

5.2

1986

5.8

2012

6.3

2016

7.9

2010

5.2