2010

6.8

2012

6.4

2009

5.3

1997

7.9

1988

6.2

2014

7.7

2023

8.0

2015

7.6

2007

6.6

2020

8.1

2008

6.8

1997

6.6

1975

7.7

2015

7.9

1985

7.7

1995

5.6

1998

6.0

2006

6.3

1986

7.1

2023

6.9