1992

5.0

2008

6.8

2000

7.4

2002

6.4

1999

5.4

1989

6.0

2004

3.8

2010

4.5

2012

6.3

1991

5.8

2011

5.3

2011

3.4

2018

5.7

2009

3.5

1998

5.8

1977

4.1

2015

4.6

2019

6.1

2009

6.0

2017

6.7