1989

5.8

2010

6.1

2011

9.5

1974

6.4

1991

5.8

9.4

2009

8.5

6.1

2015

7.8

1997

6.3

2022

7.0

2012

9.7

2007

10.0

1990

4.4

1982

5.9

2015

5.9

1988

5.5

2016

5.0

2017

9.5