1994

8.9

2012

7.8

2012

6.3

2013

8.0

2011

5.6

2012

6.3

2007

5.4

2008

8.7

1991

6.9

2010

7.4

2004

6.0

1999

6.8

1966

6.7

2007

5.7

2023

9.2

2020

6.5

1978

3.3

2022

6.2

2015

5.7

2017

5.9