2001

7.1

2005

6.4

2008

9.2

2009

8.7

1986

7.8

1997

7.9

2007

6.7

1999

8.0

2010

8.2

2023

8.0

2015

7.9

1995

5.6

2019

8.1

1985

8.3

2002

7.1

2008

6.8

2011

7.5

1979

8.1

1995

4.6

2004

5.9