1991

5.9

2015

6.7

2011

3.8

1992

6.2

2011

2.0

2010

5.3

1987

5.4

2017

0.0

2014

4.0

2002

6.8

2017

4.2

1977

7.3

2007

0.0

2017

7.0

2019

8.2

2011

5.0

2020

4.7

1984

6.2

1972

6.9

2018

5.6