1970

5.8

2014

5.7

1990

7.1

1993

7.6

1966

7.8

1999

6.0

2012

6.0

2005

7.1

2003

7.9

1995

7.4

2006

7.1

1996

7.0

2021

5.0

2013

8.3

1997

7.5

2003

7.1

2016

6.7

2016

6.2

2008

6.5

2021

5.0