2000

5.2

2004

7.9

1980

6.7

2015

6.4

2009

7.7

2010

8.2

2003

6.2

2004

5.5

1997

5.6

2013

6.1

2002

7.1

2004

8.0

2019

6.7

1972

6.4

2007

6.6

1995

7.2

1999

5.1

1990

6.1

2011

6.9

2019

6.7